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 ff7d772..e539d25 100644
--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -1386,7 +1386,9 @@
// 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
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
+}
