From 5fe4cd83a8a7b91c5872d36db88858510b530b90 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Fri, 17 Oct 2008 17:51:29 -0700
Subject: [PATCH] do not set t->recur on basic types. the comment talked about
 printing, but now t->recur is only used for typehash. in typehash it is
 important to compute different hashes for the different basic types.

add test that makes sure an interface { X() int8 }
cannot be used as interface { X() int64 }

R=ken
OCL=17396
CL=17396
---
 src/cmd/gc/lex.c   |  1 -
 test/golden.out    |  8 ++++++++
 test/interface3.go | 23 +++++++++++++++++++++++
 3 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 test/interface3.go

diff --git a/src/cmd/gc/lex.c b/src/cmd/gc/lex.c
index d0bff27419..de9700da3d 100644
--- a/src/cmd/gc/lex.c
+++ b/src/cmd/gc/lex.c
@@ -1120,7 +1120,6 @@ lexinit(void)
 		}
 
 		t->sym = s;
-		t->recur = 1;	// supresses printing beyond name
 
 		dowidth(t);
 		types[etype] = t;
diff --git a/test/golden.out b/test/golden.out
index 19988f2aa4..9139d49d9e 100644
--- a/test/golden.out
+++ b/test/golden.out
@@ -34,6 +34,14 @@ Faulting address: 0x0
 pc: xxx
 
 
+=========== ./interface3.go
+cannot convert type S to interface I2: missing method Name
+throw: interface conversion
+SIGSEGV: segmentation violation
+Faulting address: 0x0
+pc: xxx
+
+
 =========== ./peano.go
 0! = 1
 1! = 1
diff --git a/test/interface3.go b/test/interface3.go
new file mode 100644
index 0000000000..04af91a029
--- /dev/null
+++ b/test/interface3.go
@@ -0,0 +1,23 @@
+// $G $D/$F.go && $L $F.$A && (! ./$A.out || echo BUG: should not succeed)
+
+// 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
+
+type S struct { a int }
+type T struct { b string }
+
+func (s *S) Name() int8 { return 1 }
+func (t *T) Name() int64 { return 64 }
+
+type I1 interface { Name() int8 }
+type I2 interface { Name() int64 }
+
+func main() {
+	var i1 I1;
+	var s *S;
+	i1 = s;
+	print(i1.(I2).Name())
+}