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go/test/fixedbugs/issue9521.go
Russ Cox 3f209abb29 cmd/internal/gc: detect bad append(f()) during type check
Today's earlier fix can stay, but it's a band-aid over the real problem,
which is that bad code was slipping through the type checker
into the back end (and luckily causing a type error there).

I discovered this because my new append does not use the same
temporaries and failed the test as written.

Fixes #9521.

Change-Id: I7e33e2ea15743406e15c6f3fdf73e1edecda69bd
Reviewed-on: https://go-review.googlesource.com/9921
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-05-12 16:26:35 +00:00

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508 B
Go

// errorcheck
// Copyright 2015 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.
// Test that an incorrect use of the blank identifer is caught.
// Does not compile.
package main
func f() (_, _ []int) { return }
func g() (x []int, y float64) { return }
func main() {
_ = append(f()) // ERROR "cannot append \[\]int value to \[\]int"
_ = append(g()) // ERROR "cannot append float64 value to \[\]int"
}