bug299: parenthesized receiver types/anonymous fields are illegal

R=r
CC=golang-dev
https://golang.org/cl/1846051

test/bugs/bug299.go

+// errchk $G $D/$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
+
+type T struct {
+	// accepted by both compilers, legal according to spec
+	x int
+	y (int)
+	int
+	*float
+	// not accepted by both compilers, not legal according to spec
+	(complex)  // ERROR "non-declaration|expected"
+	(*string)  // ERROR "non-declaration|expected"
+	*(bool)    // ERROR "non-declaration|expected"
+}
+
+// accepted by both compilers, legal according to spec
+func (p T) m() {}
+
+// accepted by 6g, not accepted by gccgo, not legal according to spec
+func (p (T)) f() {}   // ERROR "expected"
+func (p *(T)) g() {}  // ERROR "expected"
+func (p (*T)) h() {}  // ERROR "expected"

test/golden.out

@@ -177,3 +177,12 @@ panic PC=xxx
 =========== bugs/bug260.go
 FAIL
 BUG: bug260 failed
+
+=========== bugs/bug299.go
+BUG: errchk: bugs/bug299.go:25: missing expected error: 'expected'
+errchk: bugs/bug299.go:26: missing expected error: 'expected'
+errchk: bugs/bug299.go:27: missing expected error: 'expected'
+errchk: bugs/bug299.go: unmatched error messages:
+==================================================
+bugs/bug299.go:19: syntax error: unexpected }
+==================================================