Gecko [ 167.86.127.34 ]

Name	Size	Permission
embed1.dir	[ DIR ]	drwxr-xr-x
embed3.dir	[ DIR ]	drwxr-xr-x
private.dir	[ DIR ]	drwxr-xr-x
recursive1.dir	[ DIR ]	drwxr-xr-x
assertinline.go	1.77 KB	-rw-r--r--
bigdata.go	1.45 KB	-rw-r--r--
convert.go	1.88 KB	-rw-r--r--
convert1.go	393 B	-rw-r--r--
convert2.go	393 B	-rw-r--r--
embed.go	924 B	-rw-r--r--
embed1.go	250 B	-rw-r--r--
embed2.go	1.38 KB	-rw-r--r--
embed3.go	187 B	-rw-r--r--
explicit.go	1.88 KB	-rw-r--r--
fail.go	544 B	-rw-r--r--
fake.go	1.75 KB	-rw-r--r--
noeq.go	641 B	-rw-r--r--
pointer.go	742 B	-rw-r--r--
private.go	285 B	-rw-r--r--
receiver.go	1.26 KB	-rw-r--r--
receiver1.go	768 B	-rw-r--r--
recursive.go	374 B	-rw-r--r--
recursive1.go	267 B	-rw-r--r--
returntype.go	670 B	-rw-r--r--
struct.go	2.43 KB	-rw-r--r--

Code Editor : explicit.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 compiler messages about erroneous static interface conversions.
// Does not compile.

package main

type T struct {
	a int
}

var t *T

type X int

func (x *X) M() {}

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 "incompatible|missing M method"
	t = i // ERROR "incompatible|assignment$"

i = i2 // ok
	i2 = i // ERROR "incompatible|missing N method"

i = I(i2)  // ok
	i2 = I2(i) // ERROR "invalid|missing N method"

e = E(t) // ok
	t = T(e) // ERROR "need explicit|need type assertion|incompatible"

// cannot type-assert non-interfaces
	f := 2.0
	_ = f.(int) // ERROR "non-interface type"

}

type M interface {
	M()
}

var m M

var _ = m.(int) // ERROR "impossible type assertion"

type Int int

func (Int) M(float64) {}

var _ = m.(Int) // ERROR "impossible type assertion"

var _ = m.(X) // ERROR "pointer receiver"

var ii int
var jj Int

var m1 M = ii // ERROR "incompatible|missing"
var m2 M = jj // ERROR "incompatible|wrong type for M method"

var m3 = M(ii) // ERROR "invalid|missing"
var m4 = M(jj) // ERROR "invalid|wrong type for M method"

type B1 interface {
	_() // ERROR "methods must have a unique non-blank name"
}

type B2 interface {
	M()
	_() // ERROR "methods must have a unique non-blank name"
}

type T2 struct{}

func (t *T2) M() {}
func (t *T2) _() {}

// Check that nothing satisfies an interface with blank methods.
var b1 B1 = &T2{} // ERROR "incompatible|missing _ method"
var b2 B2 = &T2{} // ERROR "incompatible|missing _ method"

${this.title}

Code Editor : explicit.go