go/parser: selectors may be method expressions

R=adonovan
CC=golang-dev
https://golang.org/cl/12062043

src/pkg/go/parser/parser.go

@@ -1408,7 +1408,7 @@ L:
 			}
 			switch p.tok {
 			case token.IDENT:
-				x = p.parseSelector(p.checkExpr(x))
+				x = p.parseSelector(p.checkExprOrType(x))
 			case token.LPAREN:
 				x = p.parseTypeAssertion(p.checkExpr(x))
 			default:

src/pkg/go/parser/short_test.go

@@ -34,6 +34,7 @@ var valids = []string{
 	`package p; func f() { switch ; {} };`,
 	`package p; func f() { for _ = range "foo" + "bar" {} };`,
 	`package p; func f() { var s []int; g(s[:], s[i:], s[:j], s[i:j], s[i:j:k], s[:j:k]) };`,
+	`package p; var ( _ = (struct {*T}).m; _ = (interface {T}).m )`,
 }
 
 func TestValid(t *testing.T) {