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go/test/fixedbugs/issue6750.go

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cmd/compile: improve error message for wrong number of arguments to return Fixes #4215. Fixes #6750. Improves the error message for wrong number of arguments by comparing the signature of the return call site arguments, versus the function's expected return arguments. In this CL, the signature representation of: + ideal numbers(TIDEAL) ie float*, complex*, rune, int is "number" instead of "untyped number". + idealstring is "string" instead of "untyped string". + idealbool is "bool" instead of "untyped bool". However, the representation of other types remains as the compiler would produce. * Example 1(in the error messages, if all lines were printed): $ cat main.go && go run main.go package main func foo() (int, int) { return 2.3 } func foo2() { return int(2), 2 } func foo3(v int) (a, b, c, d int) { if v >= 5 { return 1 } return 2, 3 } func foo4(name string) (string, int) { switch name { case "cow": return "moo" case "dog": return "dog", 10, true case "fish": return "" default: return "lizard", 10 } } type S int type T string type U float64 func foo5() (S, T, U) { if false { return "" } else { ptr := new(T) return ptr } return new(S), 12.34, 1 + 0i, 'r', true } func foo6() (T, string) { return "T" } ./issue4215.go:4: not enough arguments to return, got (number) want (int, int) ./issue4215.go:8: too many arguments to return, got (int, number) want () ./issue4215.go:13: not enough arguments to return, got (number) want (int, int, int, int) ./issue4215.go:15: not enough arguments to return, got (number, number) want (int, int, int, int) ./issue4215.go:21: not enough arguments to return, got (string) want (string, int) ./issue4215.go:23: too many arguments to return, got (string, number, bool) want (string, int) ./issue4215.go:25: not enough arguments to return, got (string) want (string, int) ./issue4215.go:37: not enough arguments to return, got (string) want (S, T, U) ./issue4215.go:40: not enough arguments to return, got (*T) want (S, T, U) ./issue4215.go:42: too many arguments to return, got (*S, number, number, number, bool) want (S, T, U) ./issue4215.go:46: not enough arguments to return, got (string) want (T, string) ./issue4215.go:46: too many errors * Example 2: $ cat 6750.go && go run 6750.go package main import "fmt" func printmany(nums ...int) { for i, n := range nums { fmt.Printf("%d: %d\n", i, n) } fmt.Printf("\n") } func main() { printmany(1, 2, 3) printmany([]int{1, 2, 3}...) printmany(1, "abc", []int{2, 3}...) } ./issue6750.go:15: too many arguments in call to printmany, got (number, string, []int) want (...int) Change-Id: I6fdce78553ae81770840070e2c975d3e3c83d5d8 Reviewed-on: https://go-review.googlesource.com/25156 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
2016-07-23 16:41:57 -06:00
// errorcheck
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import "fmt"
func printmany(nums ...int) {
for i, n := range nums {
fmt.Printf("%d: %d\n", i, n)
}
fmt.Printf("\n")
}
func main() {
printmany(1, 2, 3)
printmany([]int{1, 2, 3}...)
printmany(1, "abc", []int{2, 3}...) // ERROR "too many arguments in call to printmany, got \(number, string, \[\]int\) want \(...int\)"
}
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