go/types: fix (some) builds

The position (type) for which the "invalid cycle" error
message is reported depends on which type in a cycle of
types is first checked. Which one is first depends on
the iteration order of maps which is different on
different platforms. For now, disable this error message.

R=rsc
CC=golang-dev
https://golang.org/cl/4527059

src/pkg/go/types/check.go

@@ -118,7 +118,10 @@ func (c *checker) makeType(x ast.Expr, cycleOk bool) (typ Type) {
 		}
 		c.checkObj(obj, cycleOk)
 		if !cycleOk && obj.Type.(*Name).Underlying == nil {
-			msg := c.errorf(obj.Pos(), "illegal cycle in declaration of %s", obj.Name)
+			// TODO(gri) Enable this message again once its position
+			// is independent of the underlying map implementation.
+			// msg := c.errorf(obj.Pos(), "illegal cycle in declaration of %s", obj.Name)
+			msg := "illegal cycle"
 			return &Bad{Msg: msg}
 		}
 		return obj.Type.(Type)

src/pkg/go/types/testdata/test0.src

@@ -39,7 +39,7 @@ type (
 type (
 	Pi pi /* ERROR "not a type" */
 
-	a /* ERROR "illegal cycle" */ a
+	a /* DISABLED "illegal cycle" */ a
 	a /* ERROR "redeclared" */ int
 
 	// where the cycle error appears depends on the
@@ -47,7 +47,7 @@ type (
 	// (which depends on the order in which a map
 	// is iterated through)
 	b c
-	c /* ERROR "illegal cycle" */ d
+	c /* DISABLED "illegal cycle" */ d
 	d e
 	e b
 
@@ -74,13 +74,13 @@ type (
 	S3 struct {
 		x S2
 	}
-	S4/* ERROR "illegal cycle" */ struct {
+	S4/* DISABLED "illegal cycle" */ struct {
 		S4
 	}
 	S5 struct {
 		S6
 	}
-	S6 /* ERROR "illegal cycle" */ struct {
+	S6 /* DISABLED "illegal cycle" */ struct {
 		field S7
 	}
 	S7 struct {
@@ -91,8 +91,8 @@ type (
 	L2 []int
 
 	A1 [10]int
-	A2 /* ERROR "illegal cycle" */ [10]A2
-	A3 /* ERROR "illegal cycle" */ [10]struct {
+	A2 /* DISABLED "illegal cycle" */ [10]A2
+	A3 /* DISABLED "illegal cycle" */ [10]struct {
 		x A4
 	}
 	A4 [10]A3
@@ -127,10 +127,10 @@ type (
 		I1
 		I1
 	}
-	I8 /* ERROR "illegal cycle" */ interface {
+	I8 /* DISABLED "illegal cycle" */ interface {
 		I8
 	}
-	I9 /* ERROR "illegal cycle" */ interface {
+	I9 /* DISABLED "illegal cycle" */ interface {
 		I10
 	}
 	I10 interface {