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https://github.com/golang/go
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72ad2f44ea
Added a new flag -G to run. Setting -G (as in: go run run.go -G) will run tests marked with "errorcheck" (and no other flags) also with the compiler using the new typechecker. Many tests don't pass yet (due to discrepancies in error messages). The top-level tests in the test directory which don't pass yet have been explicitly excluded, permitting to see the current status. Future CLs will bring error messages in sync and eventually all tests should pass. Change-Id: I7caf5eff413e173f68d092af4bbe458434718d74 Reviewed-on: https://go-review.googlesource.com/c/go/+/274313 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
87 lines
2.2 KiB
Go
87 lines
2.2 KiB
Go
// errorcheck
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// Copyright 2010 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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// Verify that incorrect comparisons are detected.
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// Does not compile.
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package main
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func use(bool) {}
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type T1 *int
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type T2 *int
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type T3 struct{ z []int }
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var t3 T3
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type T4 struct {
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_ []int
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a float64
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}
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var t4 T4
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func main() {
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// Arguments to comparison must be
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// assignable one to the other (or vice versa)
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// so chan int can be compared against
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// directional channels but channel of different
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// direction cannot be compared against each other.
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var c1 chan<- int
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var c2 <-chan int
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var c3 chan int
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use(c1 == c2) // ERROR "invalid operation|incompatible"
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use(c2 == c1) // ERROR "invalid operation|incompatible"
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use(c1 == c3)
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use(c2 == c2)
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use(c3 == c1)
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use(c3 == c2)
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// Same applies to named types.
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var p1 T1
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var p2 T2
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var p3 *int
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use(p1 == p2) // ERROR "invalid operation|incompatible"
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use(p2 == p1) // ERROR "invalid operation|incompatible"
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use(p1 == p3)
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use(p2 == p2)
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use(p3 == p1)
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use(p3 == p2)
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// Arrays are comparable if and only if their element type is comparable.
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var a1 [1]int
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var a2 [1]func()
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var a3 [0]func()
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use(a1 == a1)
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use(a2 == a2) // ERROR "invalid operation|invalid comparison"
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use(a3 == a3) // ERROR "invalid operation|invalid comparison"
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// Comparison of structs should have a good message
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use(t3 == t3) // ERROR "struct|expected|cannot compare"
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use(t4 == t4) // ERROR "cannot be compared|non-comparable|cannot compare"
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// Slices, functions, and maps too.
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var x []int
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var f func()
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var m map[int]int
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use(x == x) // ERROR "slice can only be compared to nil|cannot compare"
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use(f == f) // ERROR "func can only be compared to nil|cannot compare"
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use(m == m) // ERROR "map can only be compared to nil|cannot compare"
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// Comparison with interface that cannot return true
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// (would panic).
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var i interface{}
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use(i == x) // ERROR "invalid operation"
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use(x == i) // ERROR "invalid operation"
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use(i == f) // ERROR "invalid operation"
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use(f == i) // ERROR "invalid operation"
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use(i == m) // ERROR "invalid operation"
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use(m == i) // ERROR "invalid operation"
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}
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