mirror of
https://github.com/golang/go
synced 2024-11-18 12:04:57 -07:00
2890 lines
33 KiB
Go
2890 lines
33 KiB
Go
// errorcheck
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test compiler diagnosis of function missing return statements.
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// See issue 65 and golang.org/s/go11return.
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package p
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type T int
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var x interface{}
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var c chan int
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func external() int // ok
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func _() int {
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} // ERROR "missing return"
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func _() int {
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print(1)
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} // ERROR "missing return"
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// return is okay
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func _() int {
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print(1)
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return 2
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}
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// goto is okay
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func _() int {
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L:
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print(1)
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goto L
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}
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// panic is okay
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func _() int {
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print(1)
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panic(2)
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}
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// but only builtin panic
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func _() int {
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var panic = func(int) {}
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print(1)
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panic(2)
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} // ERROR "missing return"
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// block ending in terminating statement is okay
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func _() int {
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{
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print(1)
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return 2
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}
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}
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// block ending in terminating statement is okay
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func _() int {
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L:
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{
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print(1)
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goto L
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}
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}
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// block ending in terminating statement is okay
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func _() int {
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print(1)
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{
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panic(2)
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}
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}
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// adding more code - even though it is dead - now requires a return
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func _() int {
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print(1)
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return 2
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print(3)
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} // ERROR "missing return"
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func _() int {
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L:
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print(1)
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goto L
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print(3)
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} // ERROR "missing return"
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func _() int {
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print(1)
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panic(2)
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print(3)
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} // ERROR "missing return"
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func _() int {
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{
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print(1)
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return 2
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print(3)
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}
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} // ERROR "missing return"
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func _() int {
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L:
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{
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print(1)
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goto L
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print(3)
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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{
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panic(2)
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print(3)
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}
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} // ERROR "missing return"
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func _() int {
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{
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print(1)
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return 2
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}
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print(3)
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} // ERROR "missing return"
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func _() int {
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L:
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{
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print(1)
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goto L
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}
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print(3)
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} // ERROR "missing return"
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func _() int {
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print(1)
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{
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panic(2)
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}
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print(3)
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} // ERROR "missing return"
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// even an empty dead block triggers the message, because it
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// becomes the final statement.
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func _() int {
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print(1)
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return 2
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{}
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} // ERROR "missing return"
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func _() int {
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L:
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print(1)
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goto L
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{}
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} // ERROR "missing return"
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func _() int {
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print(1)
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panic(2)
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{}
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} // ERROR "missing return"
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func _() int {
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{
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print(1)
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return 2
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{}
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}
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} // ERROR "missing return"
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func _() int {
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L:
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{
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print(1)
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goto L
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{}
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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{
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panic(2)
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{}
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}
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} // ERROR "missing return"
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func _() int {
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{
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print(1)
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return 2
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}
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{}
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} // ERROR "missing return"
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func _() int {
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L:
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{
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print(1)
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goto L
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}
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{}
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} // ERROR "missing return"
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func _() int {
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print(1)
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{
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panic(2)
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}
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{}
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} // ERROR "missing return"
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// if-else chain with final else and all terminating is okay
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func _() int {
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print(1)
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if x == nil {
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panic(2)
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} else {
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panic(3)
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}
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}
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func _() int {
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L:
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print(1)
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if x == nil {
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panic(2)
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} else {
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goto L
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}
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}
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func _() int {
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L:
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print(1)
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if x == nil {
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panic(2)
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} else if x == 1 {
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return 0
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} else if x != 2 {
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panic(3)
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} else {
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goto L
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}
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}
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// if-else chain missing final else is not okay, even if the
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// conditions cover every possible case.
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func _() int {
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print(1)
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if x == nil {
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panic(2)
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} else if x != nil {
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panic(3)
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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if x == nil {
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panic(2)
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}
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} // ERROR "missing return"
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func _() int {
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L:
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print(1)
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if x == nil {
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panic(2)
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} else if x == 1 {
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return 0
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} else if x != 1 {
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panic(3)
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}
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} // ERROR "missing return"
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// for { loops that never break are okay.
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func _() int {
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print(1)
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for {}
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}
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func _() int {
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for {
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for {
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break
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}
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}
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}
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func _() int {
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for {
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L:
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for {
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break L
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}
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}
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}
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// for { loops that break are not okay.
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func _() int {
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print(1)
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for { break }
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} // ERROR "missing return"
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func _() int {
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for {
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for {
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}
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break
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}
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} // ERROR "missing return"
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func _() int {
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L:
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for {
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for {
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break L
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}
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}
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} // ERROR "missing return"
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// if there's a condition - even "true" - the loops are no longer syntactically terminating
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func _() int {
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print(1)
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for x == nil {}
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} // ERROR "missing return"
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func _() int {
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for x == nil {
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for {
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break
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}
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}
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} // ERROR "missing return"
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func _() int {
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for x == nil {
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L:
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for {
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break L
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}
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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for true {}
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} // ERROR "missing return"
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func _() int {
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for true {
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for {
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break
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}
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}
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} // ERROR "missing return"
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func _() int {
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for true {
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L:
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for {
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break L
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}
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}
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} // ERROR "missing return"
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// select in which all cases terminate and none break are okay.
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func _() int {
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print(1)
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select{}
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}
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func _() int {
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print(1)
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select {
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case <-c:
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print(2)
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panic("abc")
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}
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}
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func _() int {
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print(1)
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select {
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case <-c:
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print(2)
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for{}
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}
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}
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func _() int {
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L:
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print(1)
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select {
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case <-c:
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print(2)
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panic("abc")
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case c <- 1:
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print(2)
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goto L
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}
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}
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func _() int {
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print(1)
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select {
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case <-c:
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print(2)
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panic("abc")
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default:
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select{}
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}
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}
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// if any cases don't terminate, the select isn't okay anymore
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func _() int {
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print(1)
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select {
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case <-c:
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print(2)
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}
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} // ERROR "missing return"
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func _() int {
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L:
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print(1)
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select {
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case <-c:
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print(2)
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panic("abc")
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goto L
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case c <- 1:
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print(2)
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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select {
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case <-c:
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print(2)
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panic("abc")
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default:
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print(2)
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}
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} // ERROR "missing return"
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// if any breaks refer to the select, the select isn't okay anymore, even if they're dead
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func _() int {
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print(1)
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select{ default: break }
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} // ERROR "missing return"
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func _() int {
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print(1)
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select {
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case <-c:
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print(2)
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panic("abc")
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break
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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L:
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select {
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case <-c:
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print(2)
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for{ break L }
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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L:
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select {
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case <-c:
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print(2)
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panic("abc")
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case c <- 1:
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print(2)
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break L
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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select {
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case <-c:
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print(1)
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panic("abc")
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default:
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select{}
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break
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}
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} // ERROR "missing return"
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// switch with default in which all cases terminate is okay
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func _() int {
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print(1)
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switch x {
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case 1:
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print(2)
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panic(3)
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default:
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return 4
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}
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}
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func _() int {
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print(1)
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switch x {
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default:
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return 4
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case 1:
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print(2)
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panic(3)
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}
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}
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func _() int {
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print(1)
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switch x {
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case 1:
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print(2)
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fallthrough
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default:
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return 4
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}
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}
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// if no default or some case doesn't terminate, switch is no longer okay
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func _() int {
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print(1)
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switch {
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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switch x {
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case 1:
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print(2)
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panic(3)
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case 2:
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return 4
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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switch x {
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case 2:
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return 4
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case 1:
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print(2)
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panic(3)
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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switch x {
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case 1:
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print(2)
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fallthrough
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case 2:
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return 4
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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switch x {
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case 1:
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print(2)
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panic(3)
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}
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} // ERROR "missing return"
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// if any breaks refer to the switch, switch is no longer okay
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func _() int {
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print(1)
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L:
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switch x {
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case 1:
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print(2)
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panic(3)
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break L
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default:
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return 4
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}
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} // ERROR "missing return"
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|
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func _() int {
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print(1)
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switch x {
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default:
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return 4
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break
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case 1:
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print(2)
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panic(3)
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}
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} // ERROR "missing return"
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func _() int {
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print(1)
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L:
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switch x {
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case 1:
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print(2)
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for {
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break L
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}
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default:
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return 4
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}
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} // ERROR "missing return"
|
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|
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// type switch with default in which all cases terminate is okay
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|
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func _() int {
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print(1)
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switch x.(type) {
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case int:
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print(2)
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panic(3)
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default:
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return 4
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}
|
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}
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|
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func _() int {
|
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print(1)
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switch x.(type) {
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default:
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return 4
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case int:
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print(2)
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panic(3)
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}
|
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}
|
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|
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func _() int {
|
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print(1)
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switch x.(type) {
|
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case int:
|
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print(2)
|
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fallthrough
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default:
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return 4
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}
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}
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|
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// if no default or some case doesn't terminate, switch is no longer okay
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|
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func _() int {
|
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print(1)
|
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switch {
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}
|
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} // ERROR "missing return"
|
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|
|
|
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func _() int {
|
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print(1)
|
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switch x.(type) {
|
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case int:
|
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print(2)
|
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panic(3)
|
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case float64:
|
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return 4
|
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}
|
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} // ERROR "missing return"
|
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|
|
func _() int {
|
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print(1)
|
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switch x.(type) {
|
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case float64:
|
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return 4
|
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case int:
|
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print(2)
|
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panic(3)
|
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}
|
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} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
print(1)
|
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switch x.(type) {
|
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case int:
|
|
print(2)
|
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fallthrough
|
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case float64:
|
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return 4
|
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}
|
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} // ERROR "missing return"
|
|
|
|
func _() int {
|
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print(1)
|
|
switch x.(type) {
|
|
case int:
|
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print(2)
|
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panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// if any breaks refer to the switch, switch is no longer okay
|
|
|
|
func _() int {
|
|
print(1)
|
|
L:
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
break L
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
print(1)
|
|
switch x.(type) {
|
|
default:
|
|
return 4
|
|
break
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
print(1)
|
|
L:
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
for {
|
|
break L
|
|
}
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// again, but without the leading print(1).
|
|
// testing that everything works when the terminating statement is first.
|
|
|
|
func _() int {
|
|
} // ERROR "missing return"
|
|
|
|
// return is okay
|
|
func _() int {
|
|
return 2
|
|
}
|
|
|
|
// goto is okay
|
|
func _() int {
|
|
L:
|
|
goto L
|
|
}
|
|
|
|
// panic is okay
|
|
func _() int {
|
|
panic(2)
|
|
}
|
|
|
|
// but only builtin panic
|
|
func _() int {
|
|
var panic = func(int) {}
|
|
panic(2)
|
|
} // ERROR "missing return"
|
|
|
|
// block ending in terminating statement is okay
|
|
func _() int {
|
|
{
|
|
return 2
|
|
}
|
|
}
|
|
|
|
// block ending in terminating statement is okay
|
|
func _() int {
|
|
L:
|
|
{
|
|
goto L
|
|
}
|
|
}
|
|
|
|
// block ending in terminating statement is okay
|
|
func _() int {
|
|
{
|
|
panic(2)
|
|
}
|
|
}
|
|
|
|
// adding more code - even though it is dead - now requires a return
|
|
|
|
func _() int {
|
|
return 2
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
goto L
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
panic(2)
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
{
|
|
return 2
|
|
print(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
{
|
|
goto L
|
|
print(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
{
|
|
panic(2)
|
|
print(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
{
|
|
return 2
|
|
}
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
{
|
|
goto L
|
|
}
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
{
|
|
panic(2)
|
|
}
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
// even an empty dead block triggers the message, because it
|
|
// becomes the final statement.
|
|
|
|
func _() int {
|
|
return 2
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
goto L
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
panic(2)
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
{
|
|
return 2
|
|
{}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
{
|
|
goto L
|
|
{}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
{
|
|
panic(2)
|
|
{}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
{
|
|
return 2
|
|
}
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
{
|
|
goto L
|
|
}
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
{
|
|
panic(2)
|
|
}
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
// if-else chain with final else and all terminating is okay
|
|
|
|
func _() int {
|
|
if x == nil {
|
|
panic(2)
|
|
} else {
|
|
panic(3)
|
|
}
|
|
}
|
|
|
|
func _() int {
|
|
L:
|
|
if x == nil {
|
|
panic(2)
|
|
} else {
|
|
goto L
|
|
}
|
|
}
|
|
|
|
func _() int {
|
|
L:
|
|
if x == nil {
|
|
panic(2)
|
|
} else if x == 1 {
|
|
return 0
|
|
} else if x != 2 {
|
|
panic(3)
|
|
} else {
|
|
goto L
|
|
}
|
|
}
|
|
|
|
// if-else chain missing final else is not okay, even if the
|
|
// conditions cover every possible case.
|
|
|
|
func _() int {
|
|
if x == nil {
|
|
panic(2)
|
|
} else if x != nil {
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
if x == nil {
|
|
panic(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
if x == nil {
|
|
panic(2)
|
|
} else if x == 1 {
|
|
return 0
|
|
} else if x != 1 {
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
// for { loops that never break are okay.
|
|
|
|
func _() int {
|
|
for {}
|
|
}
|
|
|
|
func _() int {
|
|
for {
|
|
for {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
func _() int {
|
|
for {
|
|
L:
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
}
|
|
|
|
// for { loops that break are not okay.
|
|
|
|
func _() int {
|
|
for { break }
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
for {
|
|
for {
|
|
}
|
|
break
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
for {
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// if there's a condition - even "true" - the loops are no longer syntactically terminating
|
|
|
|
func _() int {
|
|
for x == nil {}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
for x == nil {
|
|
for {
|
|
break
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
for x == nil {
|
|
L:
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
for true {}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
for true {
|
|
for {
|
|
break
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
for true {
|
|
L:
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// select in which all cases terminate and none break are okay.
|
|
|
|
func _() int {
|
|
select{}
|
|
}
|
|
|
|
func _() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
}
|
|
}
|
|
|
|
func _() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
for{}
|
|
}
|
|
}
|
|
|
|
func _() int {
|
|
L:
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
case c <- 1:
|
|
print(2)
|
|
goto L
|
|
}
|
|
}
|
|
|
|
func _() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
default:
|
|
select{}
|
|
}
|
|
}
|
|
|
|
// if any cases don't terminate, the select isn't okay anymore
|
|
|
|
func _() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
goto L
|
|
case c <- 1:
|
|
print(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
func _() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
default:
|
|
print(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
// if any breaks refer to the select, the select isn't okay anymore, even if they're dead
|
|
|
|
func _() int {
|
|
select{ default: break }
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
break
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
for{ break L }
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
case c <- 1:
|
|
print(2)
|
|
break L
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
select {
|
|
case <-c:
|
|
panic("abc")
|
|
default:
|
|
select{}
|
|
break
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// switch with default in which all cases terminate is okay
|
|
|
|
func _() int {
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
func _() int {
|
|
switch x {
|
|
default:
|
|
return 4
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
}
|
|
|
|
func _() int {
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
fallthrough
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
// if no default or some case doesn't terminate, switch is no longer okay
|
|
|
|
func _() int {
|
|
switch {
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
func _() int {
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
case 2:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
switch x {
|
|
case 2:
|
|
return 4
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
fallthrough
|
|
case 2:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// if any breaks refer to the switch, switch is no longer okay
|
|
|
|
func _() int {
|
|
L:
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
break L
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
switch x {
|
|
default:
|
|
return 4
|
|
break
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
for {
|
|
break L
|
|
}
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// type switch with default in which all cases terminate is okay
|
|
|
|
func _() int {
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
func _() int {
|
|
switch x.(type) {
|
|
default:
|
|
return 4
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
}
|
|
|
|
func _() int {
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
fallthrough
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
// if no default or some case doesn't terminate, switch is no longer okay
|
|
|
|
func _() int {
|
|
switch {
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
func _() int {
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
case float64:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
switch x.(type) {
|
|
case float64:
|
|
return 4
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
fallthrough
|
|
case float64:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// if any breaks refer to the switch, switch is no longer okay
|
|
|
|
func _() int {
|
|
L:
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
break L
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
switch x.(type) {
|
|
default:
|
|
return 4
|
|
break
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
func _() int {
|
|
L:
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
for {
|
|
break L
|
|
}
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// again, with func literals
|
|
|
|
var _ = func() int {
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
} // ERROR "missing return"
|
|
|
|
// return is okay
|
|
var _ = func() int {
|
|
print(1)
|
|
return 2
|
|
}
|
|
|
|
// goto is okay
|
|
var _ = func() int {
|
|
L:
|
|
print(1)
|
|
goto L
|
|
}
|
|
|
|
// panic is okay
|
|
var _ = func() int {
|
|
print(1)
|
|
panic(2)
|
|
}
|
|
|
|
// but only builtin panic
|
|
var _ = func() int {
|
|
var panic = func(int) {}
|
|
print(1)
|
|
panic(2)
|
|
} // ERROR "missing return"
|
|
|
|
// block ending in terminating statement is okay
|
|
var _ = func() int {
|
|
{
|
|
print(1)
|
|
return 2
|
|
}
|
|
}
|
|
|
|
// block ending in terminating statement is okay
|
|
var _ = func() int {
|
|
L:
|
|
{
|
|
print(1)
|
|
goto L
|
|
}
|
|
}
|
|
|
|
// block ending in terminating statement is okay
|
|
var _ = func() int {
|
|
print(1)
|
|
{
|
|
panic(2)
|
|
}
|
|
}
|
|
|
|
// adding more code - even though it is dead - now requires a return
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
return 2
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
print(1)
|
|
goto L
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
panic(2)
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
print(1)
|
|
return 2
|
|
print(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
{
|
|
print(1)
|
|
goto L
|
|
print(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
{
|
|
panic(2)
|
|
print(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
print(1)
|
|
return 2
|
|
}
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
{
|
|
print(1)
|
|
goto L
|
|
}
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
{
|
|
panic(2)
|
|
}
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
// even an empty dead block triggers the message, because it
|
|
// becomes the final statement.
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
return 2
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
print(1)
|
|
goto L
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
panic(2)
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
print(1)
|
|
return 2
|
|
{}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
{
|
|
print(1)
|
|
goto L
|
|
{}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
{
|
|
panic(2)
|
|
{}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
print(1)
|
|
return 2
|
|
}
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
{
|
|
print(1)
|
|
goto L
|
|
}
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
{
|
|
panic(2)
|
|
}
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
// if-else chain with final else and all terminating is okay
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
if x == nil {
|
|
panic(2)
|
|
} else {
|
|
panic(3)
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
L:
|
|
print(1)
|
|
if x == nil {
|
|
panic(2)
|
|
} else {
|
|
goto L
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
L:
|
|
print(1)
|
|
if x == nil {
|
|
panic(2)
|
|
} else if x == 1 {
|
|
return 0
|
|
} else if x != 2 {
|
|
panic(3)
|
|
} else {
|
|
goto L
|
|
}
|
|
}
|
|
|
|
// if-else chain missing final else is not okay, even if the
|
|
// conditions cover every possible case.
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
if x == nil {
|
|
panic(2)
|
|
} else if x != nil {
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
if x == nil {
|
|
panic(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
print(1)
|
|
if x == nil {
|
|
panic(2)
|
|
} else if x == 1 {
|
|
return 0
|
|
} else if x != 1 {
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
// for { loops that never break are okay.
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
for {}
|
|
}
|
|
|
|
var _ = func() int {
|
|
for {
|
|
for {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
for {
|
|
L:
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
}
|
|
|
|
// for { loops that break are not okay.
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
for { break }
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for {
|
|
for {
|
|
}
|
|
break
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
for {
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// if there's a condition - even "true" - the loops are no longer syntactically terminating
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
for x == nil {}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for x == nil {
|
|
for {
|
|
break
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for x == nil {
|
|
L:
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
for true {}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for true {
|
|
for {
|
|
break
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for true {
|
|
L:
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// select in which all cases terminate and none break are okay.
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
select{}
|
|
}
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
for{}
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
L:
|
|
print(1)
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
case c <- 1:
|
|
print(2)
|
|
goto L
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
default:
|
|
select{}
|
|
}
|
|
}
|
|
|
|
// if any cases don't terminate, the select isn't okay anymore
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
print(1)
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
goto L
|
|
case c <- 1:
|
|
print(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
default:
|
|
print(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
// if any breaks refer to the select, the select isn't okay anymore, even if they're dead
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
select{ default: break }
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
break
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
L:
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
for{ break L }
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
L:
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
case c <- 1:
|
|
print(2)
|
|
break L
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
select {
|
|
case <-c:
|
|
print(1)
|
|
panic("abc")
|
|
default:
|
|
select{}
|
|
break
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// switch with default in which all cases terminate is okay
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x {
|
|
default:
|
|
return 4
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
fallthrough
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
// if no default or some case doesn't terminate, switch is no longer okay
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch {
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
case 2:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x {
|
|
case 2:
|
|
return 4
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
fallthrough
|
|
case 2:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// if any breaks refer to the switch, switch is no longer okay
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
L:
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
break L
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x {
|
|
default:
|
|
return 4
|
|
break
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
L:
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
for {
|
|
break L
|
|
}
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// type switch with default in which all cases terminate is okay
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x.(type) {
|
|
default:
|
|
return 4
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
fallthrough
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
// if no default or some case doesn't terminate, switch is no longer okay
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch {
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
case float64:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x.(type) {
|
|
case float64:
|
|
return 4
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
fallthrough
|
|
case float64:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// if any breaks refer to the switch, switch is no longer okay
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
L:
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
break L
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
switch x.(type) {
|
|
default:
|
|
return 4
|
|
break
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
print(1)
|
|
L:
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
for {
|
|
break L
|
|
}
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// again, but without the leading print(1).
|
|
// testing that everything works when the terminating statement is first.
|
|
|
|
var _ = func() int {
|
|
} // ERROR "missing return"
|
|
|
|
// return is okay
|
|
var _ = func() int {
|
|
return 2
|
|
}
|
|
|
|
// goto is okay
|
|
var _ = func() int {
|
|
L:
|
|
goto L
|
|
}
|
|
|
|
// panic is okay
|
|
var _ = func() int {
|
|
panic(2)
|
|
}
|
|
|
|
// but only builtin panic
|
|
var _ = func() int {
|
|
var panic = func(int) {}
|
|
panic(2)
|
|
} // ERROR "missing return"
|
|
|
|
// block ending in terminating statement is okay
|
|
var _ = func() int {
|
|
{
|
|
return 2
|
|
}
|
|
}
|
|
|
|
// block ending in terminating statement is okay
|
|
var _ = func() int {
|
|
L:
|
|
{
|
|
goto L
|
|
}
|
|
}
|
|
|
|
// block ending in terminating statement is okay
|
|
var _ = func() int {
|
|
{
|
|
panic(2)
|
|
}
|
|
}
|
|
|
|
// adding more code - even though it is dead - now requires a return
|
|
|
|
var _ = func() int {
|
|
return 2
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
goto L
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
panic(2)
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
return 2
|
|
print(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
{
|
|
goto L
|
|
print(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
panic(2)
|
|
print(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
return 2
|
|
}
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
{
|
|
goto L
|
|
}
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
panic(2)
|
|
}
|
|
print(3)
|
|
} // ERROR "missing return"
|
|
|
|
// even an empty dead block triggers the message, because it
|
|
// becomes the final statement.
|
|
|
|
var _ = func() int {
|
|
return 2
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
goto L
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
panic(2)
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
return 2
|
|
{}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
{
|
|
goto L
|
|
{}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
panic(2)
|
|
{}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
return 2
|
|
}
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
{
|
|
goto L
|
|
}
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
{
|
|
panic(2)
|
|
}
|
|
{}
|
|
} // ERROR "missing return"
|
|
|
|
// if-else chain with final else and all terminating is okay
|
|
|
|
var _ = func() int {
|
|
if x == nil {
|
|
panic(2)
|
|
} else {
|
|
panic(3)
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
L:
|
|
if x == nil {
|
|
panic(2)
|
|
} else {
|
|
goto L
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
L:
|
|
if x == nil {
|
|
panic(2)
|
|
} else if x == 1 {
|
|
return 0
|
|
} else if x != 2 {
|
|
panic(3)
|
|
} else {
|
|
goto L
|
|
}
|
|
}
|
|
|
|
// if-else chain missing final else is not okay, even if the
|
|
// conditions cover every possible case.
|
|
|
|
var _ = func() int {
|
|
if x == nil {
|
|
panic(2)
|
|
} else if x != nil {
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
if x == nil {
|
|
panic(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
if x == nil {
|
|
panic(2)
|
|
} else if x == 1 {
|
|
return 0
|
|
} else if x != 1 {
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
// for { loops that never break are okay.
|
|
|
|
var _ = func() int {
|
|
for {}
|
|
}
|
|
|
|
var _ = func() int {
|
|
for {
|
|
for {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
for {
|
|
L:
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
}
|
|
|
|
// for { loops that break are not okay.
|
|
|
|
var _ = func() int {
|
|
for { break }
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for {
|
|
for {
|
|
}
|
|
break
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
for {
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// if there's a condition - even "true" - the loops are no longer syntactically terminating
|
|
|
|
var _ = func() int {
|
|
for x == nil {}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for x == nil {
|
|
for {
|
|
break
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for x == nil {
|
|
L:
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for true {}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for true {
|
|
for {
|
|
break
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
for true {
|
|
L:
|
|
for {
|
|
break L
|
|
}
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// select in which all cases terminate and none break are okay.
|
|
|
|
var _ = func() int {
|
|
select{}
|
|
}
|
|
|
|
var _ = func() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
for{}
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
L:
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
case c <- 1:
|
|
print(2)
|
|
goto L
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
default:
|
|
select{}
|
|
}
|
|
}
|
|
|
|
// if any cases don't terminate, the select isn't okay anymore
|
|
|
|
var _ = func() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
goto L
|
|
case c <- 1:
|
|
print(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
var _ = func() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
default:
|
|
print(2)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
// if any breaks refer to the select, the select isn't okay anymore, even if they're dead
|
|
|
|
var _ = func() int {
|
|
select{ default: break }
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
break
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
for{ break L }
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
select {
|
|
case <-c:
|
|
print(2)
|
|
panic("abc")
|
|
case c <- 1:
|
|
print(2)
|
|
break L
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
select {
|
|
case <-c:
|
|
panic("abc")
|
|
default:
|
|
select{}
|
|
break
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// switch with default in which all cases terminate is okay
|
|
|
|
var _ = func() int {
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
switch x {
|
|
default:
|
|
return 4
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
fallthrough
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
// if no default or some case doesn't terminate, switch is no longer okay
|
|
|
|
var _ = func() int {
|
|
switch {
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
var _ = func() int {
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
case 2:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
switch x {
|
|
case 2:
|
|
return 4
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
fallthrough
|
|
case 2:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// if any breaks refer to the switch, switch is no longer okay
|
|
|
|
var _ = func() int {
|
|
L:
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
break L
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
switch x {
|
|
default:
|
|
return 4
|
|
break
|
|
case 1:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
switch x {
|
|
case 1:
|
|
print(2)
|
|
for {
|
|
break L
|
|
}
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// type switch with default in which all cases terminate is okay
|
|
|
|
var _ = func() int {
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
switch x.(type) {
|
|
default:
|
|
return 4
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
}
|
|
|
|
var _ = func() int {
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
fallthrough
|
|
default:
|
|
return 4
|
|
}
|
|
}
|
|
|
|
// if no default or some case doesn't terminate, switch is no longer okay
|
|
|
|
var _ = func() int {
|
|
switch {
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
|
|
var _ = func() int {
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
case float64:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
switch x.(type) {
|
|
case float64:
|
|
return 4
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
fallthrough
|
|
case float64:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
// if any breaks refer to the switch, switch is no longer okay
|
|
|
|
var _ = func() int {
|
|
L:
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
break L
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
switch x.(type) {
|
|
default:
|
|
return 4
|
|
break
|
|
case int:
|
|
print(2)
|
|
panic(3)
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
var _ = func() int {
|
|
L:
|
|
switch x.(type) {
|
|
case int:
|
|
print(2)
|
|
for {
|
|
break L
|
|
}
|
|
default:
|
|
return 4
|
|
}
|
|
} // ERROR "missing return"
|
|
|
|
/**/
|