type A2 = T[int]
-func (A2 /* ERROR "cannot define new methods on instantiated type T[int]" */) m3() {}
-func (_ /* ERROR "cannot define new methods on instantiated type T[int]" */ A2) m4() {}
+func (A2 /* ERRORx `cannot define new methods on instantiated type (T\[int\]|A2)` */) m3() {}
+func (_ /* ERRORx `cannot define new methods on instantiated type (T\[int\]|A2)` */ A2) m4() {}
func (T[int]) m5() {} // int is the type parameter name, not an instantiation
func (T[* /* ERROR "must be an identifier" */ int]) m6() {} // syntax error