cmd/gc: fix 'internal error: typename ideal bool'

Fixes #6298.

R=ken2
CC=golang-dev
https://golang.org/cl/13624043

diff --git a/src/cmd/gc/walk.c b/src/cmd/gc/walk.c
index ff7d772570481127e244e6e52115ba4588bf28b5..e539d25d32a98c8e4ddc2ec9c18380b86df59720 100644 (file)
--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -1386,7 +1386,9 @@ ret:
        // constants until walk. For example, if n is y%1 == 0, the
        // walk of y%1 may have replaced it by 0.
        // Check whether n with its updated args is itself now a constant.
+       t = n->type;
        evconst(n);
+       n->type = t;
        if(n->op == OLITERAL)
                typecheck(&n, Erv);
 

diff --git a/test/fixedbugs/issue6298.go b/test/fixedbugs/issue6298.go
new file mode 100644 (file)
index 0000000..6303dbe
--- /dev/null
+++ b/test/fixedbugs/issue6298.go
@@ -0,0 +1,15 @@
+// compile
+
+// golang.org/issue/6298.
+// Used to cause "internal error: typename ideal bool"
+
+// Copyright 2013 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
+
+func main() {
+       var x interface{} = "abc"[0] == 'a'
+       _ = x
+}