change in spec results in non-error

R=gri
DELTA=4  (0 added, 3 deleted, 1 changed)
OCL=16565
CL=16579

test/func3.go

@@ -14,4 +14,4 @@ func f1(*t2, x t3);	// ERROR "named"
 func f2(t1, *t2, x t3);	// ERROR "named"
 func f3() (x int, *string);	// ERROR "named"
 
-func f4() (t1 t1);	// ERROR "type"
+func f4() (t1 t1);	// legal - scope of parameter named t1 starts in body of f4.

test/golden.out

 
-=========== ./func3.go
-BUG: errchk: func3.go: missing expected error message on line 14: 'type'
-
 =========== ./helloworld.go
 hello, world