cmd/compile/internal/syntax: make a parser error "1.7 compliant"
For code such as
if a := 10 { ...
the 1.7 compiler reported
a := 10 used as value
while the 1.8 compiler reported
invalid condition, tag, or type switch guard
Changed the error message to match the 1.7 compiler.
Fixes #18915.
Change-Id: I01308862e461922e717f9f8295a9db53d5a914eb
Reviewed-on: https://go-review.googlesource.com/36470
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/test/fixedbugs/issue18915.go b/test/fixedbugs/issue18915.go
new file mode 100644
index 0000000..a432bbc
--- /dev/null
+++ b/test/fixedbugs/issue18915.go
@@ -0,0 +1,21 @@
+// 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 "a := 10 used as value"
+ }
+
+ for b := 10 { // ERROR "b := 10 used as value"
+ }
+
+ switch c := 10 { // ERROR "c := 10 used as value"
+ }
+}
