gc: handle _ = <-c in select.

Fixes issue 238.

R=ken2
http://codereview.appspot.com/163098

4 files changed, 23 insertions, 5 deletions

diff --git a/src/cmd/gc/select.c b/src/cmd/gc/select.c
index 3f28b1c56..9cba01fa5 100644
--- a/src/cmd/gc/select.c
+++ b/src/cmd/gc/select.c
@@ -118,7 +118,7 @@ walkselect(Node *sel)
 			else {
 				// introduce temporary until we're sure this will succeed.
 				tmp = nod(OXXX, N, N);
-				tempname(tmp, n->left->type);
+				tempname(tmp, n->right->type->type);
 				a = nod(OADDR, tmp, N);
 			}
 			// selectrecv(sel *byte, hchan *chan any, elem *any) (selected bool);
diff --git a/test/bugs/bug218.go b/test/fixedbugs/bug218.go
index b2c9ede75..b2c9ede75 100644
--- a/test/bugs/bug218.go
+++ b/test/fixedbugs/bug218.go
diff --git a/test/fixedbugs/bug225.go b/test/fixedbugs/bug225.go
new file mode 100644
index 000000000..8acf66c4e
--- /dev/null
+++ b/test/fixedbugs/bug225.go
@@ -0,0 +1,22 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2009 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() {	
+	c := make(chan bool, 1);
+	select {
+	case _ = <-c:
+		panic("BUG: recv should not");
+	default:
+	}
+	c <- true;
+	select {
+	case _ = <-c:
+	default:
+		panic("BUG: recv should");
+	}
+}
diff --git a/test/golden.out b/test/golden.out
index 64bfd6ecc..9813c8313 100644
--- a/test/golden.out
+++ b/test/golden.out
@@ -142,10 +142,6 @@ panic PC=xxx
 
 == bugs/
 
-=========== bugs/bug218.go
-<epoch>: fatal error: dowidth: unknown type: blank
-BUG: bug218
-
 =========== bugs/bug219.go
 bugs/bug219.go:16: syntax error near if
 BUG: bug219