mirror of
https://github.com/golang/go
synced 2024-11-20 04:44:40 -07:00
42 lines
904 B
Go
42 lines
904 B
Go
// errchk $G $D/$F.go
|
|
|
|
// 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.
|
|
|
|
// Static error messages about interface conversions.
|
|
|
|
package main
|
|
|
|
type T struct { a int }
|
|
var t *T
|
|
|
|
type I interface { M() }
|
|
var i I
|
|
|
|
type I2 interface { M(); N(); }
|
|
var i2 I2
|
|
|
|
type E interface { }
|
|
var e E
|
|
|
|
func main() {
|
|
e = t; // ok
|
|
t = e; // ERROR "need explicit|need type assertion"
|
|
|
|
// neither of these can work,
|
|
// because i has an extra method
|
|
// that t does not, so i cannot contain a t.
|
|
i = t; // ERROR "missing|incompatible|is not"
|
|
t = i; // ERROR "missing|incompatible|is not"
|
|
|
|
i = i2; // ok
|
|
i2 = i; // ERROR "need explicit|need type assertion"
|
|
|
|
i = I(i2); // ok
|
|
i2 = I2(i); // ERROR "need explicit|need type assertion"
|
|
|
|
e = E(t); // ok
|
|
t = T(e); // ERROR "need explicit|need type assertion"
|
|
}
|