cmd/gc: check for initialization cycles in method values
Fixes #7960.
LGTM=rsc
R=rsc
CC=golang-codereviews, gri
https://golang.org/cl/159800045
diff --git a/test/fixedbugs/issue6703p.go b/test/fixedbugs/issue6703p.go
new file mode 100644
index 0000000..dad88f6
--- /dev/null
+++ b/test/fixedbugs/issue6703p.go
@@ -0,0 +1,23 @@
+// errorcheck
+
+// Copyright 2014 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.
+
+// Check for cycles in an embedded struct's method call.
+
+package embedmethcall
+
+type T int
+
+func (T) m() int {
+ _ = x
+ return 0
+}
+
+type E struct{ T }
+
+var (
+ e E
+ x = e.m() // ERROR "initialization loop|depends upon itself"
+)
