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go/test/fixedbugs/issue18915.go
Robert Griesemer ffc0573b85 cmd/compile/internal/syntax: better error when an assignment is used in value context
The error message is now positioned at the statement position (which is
an identifing token, such as the '=' for assignments); and in case of
assignments it emphasizes the assignment by putting the Lhs and Rhs
in parentheses. Finally, the wording is changed from "use of * as value"
to the stronger "cannot use * as value" (for which there is precedent
elsewhere in the parser).

Fixes #36858.

Change-Id: Ic3f101bba50f58e3a1d9b29645066634631f2d61
Reviewed-on: https://go-review.googlesource.com/c/go/+/218337
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-02-21 22:57:52 +00:00

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Go

// errorcheck
// Copyright 2017 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.
// Make sure error message for invalid conditions
// or tags are consistent with earlier Go versions.
package p
func _() {
if a := 10 { // ERROR "cannot use a := 10 as value"
}
for b := 10 { // ERROR "cannot use b := 10 as value"
}
switch c := 10 { // ERROR "cannot use c := 10 as value"
}
}