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go/test/method2.go
Robert Griesemer 6019a52d4d go/types, types2: better error message when using *interface instead of interface
- detect *interface case and report specific error
- replaced switch with sequence of if's for more clarity
- fixed isInterfacePtr: it applies to all interfaces, incl.
  type parameters
- reviewed/fixed all uses of isInterfacePtr
- adjusted error messages to be consistently of the format
  "type %s is pointer to interface, not interface"

Fixes #48312.

Change-Id: Ic3c8cfcf93ad57ecdb60f6a727cce9e1aa4afb5d
Reviewed-on: https://go-review.googlesource.com/c/go/+/376914
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
2022-01-10 22:48:40 +00:00

42 lines
1.2 KiB
Go

// errorcheck
// Copyright 2009 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.
// Verify that pointers and interface types cannot be method receivers.
// Does not compile.
package main
type T struct {
a int
}
type P *T
type P1 *T
func (p P) val() int { return 1 } // ERROR "receiver.* pointer|invalid pointer or interface receiver|invalid receiver"
func (p *P1) val() int { return 1 } // ERROR "receiver.* pointer|invalid pointer or interface receiver|invalid receiver"
type I interface{}
type I1 interface{}
func (p I) val() int { return 1 } // ERROR "receiver.*interface|invalid pointer or interface receiver"
func (p *I1) val() int { return 1 } // ERROR "receiver.*interface|invalid pointer or interface receiver"
type Val interface {
val() int
}
var _ = (*Val).val // ERROR "method|type \*Val is pointer to interface, not interface"
var v Val
var pv = &v
var _ = pv.val() // ERROR "undefined|pointer to interface"
var _ = pv.val // ERROR "undefined|pointer to interface"
func (t *T) g() int { return t.a }
var _ = (T).g() // ERROR "needs pointer receiver|undefined|method requires pointer|cannot call pointer method"