From 15dcdf751cfd9f075c3071b3ca1d5303334f2694 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Tue, 31 May 2011 15:52:04 -0400
Subject: [PATCH] gc: fix m[x], _ = y.(T)

Fixes #1900.

R=ken2
CC=golang-dev
https://golang.org/cl/4561053
---
 src/cmd/gc/walk.c        |  2 +-
 test/fixedbugs/bug343.go | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)
 create mode 100644 test/fixedbugs/bug343.go

diff --git a/src/cmd/gc/walk.c b/src/cmd/gc/walk.c
index 68885e6596..70dc407593 100644
--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -1532,7 +1532,7 @@ ascompatee(int op, NodeList *nl, NodeList *nr, NodeList **init)
 static int
 fncall(Node *l, Type *rt)
 {
-	if(l->ullman >= UINF)
+	if(l->ullman >= UINF || l->op == OINDEXMAP)
 		return 1;
 	if(eqtype(l->type, rt))
 		return 0;
diff --git a/test/fixedbugs/bug343.go b/test/fixedbugs/bug343.go
new file mode 100644
index 0000000000..efc87e3d7a
--- /dev/null
+++ b/test/fixedbugs/bug343.go
@@ -0,0 +1,33 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: bug343
+
+// Copyright 2011 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.
+
+// issue 1900
+
+package main
+
+func getArgs(data map[string]interface{}, keys ...string) map[string]string {
+       ret := map[string]string{}
+       var ok bool
+       for _, k := range keys {
+               ret[k], ok = data[k].(string)
+               if !ok {}
+       }
+       return ret
+}
+
+func main() {
+	x := getArgs(map[string]interface{}{"x":"y"}, "x")
+	if x["x"] != "y" {
+		println("BUG bug343", x)
+	}
+}
+	
+
+/*
+typecheck [1008592b0]
+.   INDREG a(1) l(15) x(24) tc(2) runtime.ret G0 string
+bug343.go:15: internal compiler error: typecheck INDREG
+*/
-- 
2.48.1