Imported Upstream version 60upstream/60

1 files changed, 49 insertions, 0 deletions

diff --git a/test/cmp6.go b/test/cmp6.go
new file mode 100644
index 000000000..b3ea8ffeb
--- /dev/null
+++ b/test/cmp6.go
@@ -0,0 +1,49 @@
+// errchk $G -e $D/$F.go
+
+// Copyright 2010 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 use(bool) {}
+
+type T1 *int
+type T2 *int
+
+type T3 struct {}
+
+var t3 T3
+
+func main() {
+	// Arguments to comparison must be
+	// assignable one to the other (or vice versa)
+	// so chan int can be compared against
+	// directional channels but channel of different
+	// direction cannot be compared against each other.
+	var c1 chan <-int
+	var c2 <-chan int
+	var c3 chan int
+	
+	use(c1 == c2)	// ERROR "invalid operation|incompatible"
+	use(c2 == c1)	// ERROR "invalid operation|incompatible"
+	use(c1 == c3)
+	use(c2 == c2)
+	use(c3 == c1)
+	use(c3 == c2)
+
+	// Same applies to named types.
+	var p1 T1
+	var p2 T2
+	var p3 *int
+	
+	use(p1 == p2)	// ERROR "invalid operation|incompatible"
+	use(p2 == p1)	// ERROR "invalid operation|incompatible"
+	use(p1 == p3)
+	use(p2 == p2)
+	use(p3 == p1)
+	use(p3 == p2)
+	
+	// Comparison of structs should have a good message
+	use(t3 == t3)	// ERROR "struct|expected"
+}