mirror of
https://github.com/golang/go
synced 2024-11-23 15:00:03 -07:00
336ce966e4
For #55326 Change-Id: I3d0ff7f820f7b2009d1b226abf701b2337fe8cbc Reviewed-on: https://go-review.googlesource.com/c/go/+/432635 TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Robert Griesemer <gri@google.com> Run-TryBot: Robert Griesemer <gri@google.com> Reviewed-by: Robert Findley <rfindley@google.com> Run-TryBot: xie cui <523516579@qq.com> Reviewed-by: Robert Griesemer <gri@google.com>
107 lines
2.0 KiB
Go
107 lines
2.0 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 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 method M"
|
|
t = i // ERROR "incompatible|assignment$"
|
|
|
|
i = i2 // ok
|
|
i2 = i // ERROR "incompatible|missing method N"
|
|
|
|
i = I(i2) // ok
|
|
i2 = I2(i) // ERROR "invalid|missing N method|cannot convert"
|
|
|
|
e = E(t) // ok
|
|
t = T(e) // ERROR "need explicit|need type assertion|incompatible|cannot convert"
|
|
|
|
// cannot type-assert non-interfaces
|
|
f := 2.0
|
|
_ = f.(int) // ERROR "non-interface type|only valid for interface types|not an interface"
|
|
|
|
}
|
|
|
|
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 method M"
|
|
|
|
var m3 = M(ii) // ERROR "invalid|missing|cannot convert"
|
|
var m4 = M(jj) // ERROR "invalid|wrong type for M method|cannot convert"
|
|
|
|
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) _() {}
|
|
|
|
// Already reported about the invalid blank interface method above;
|
|
// no need to report about not implementing it.
|
|
var b1 B1 = &T2{}
|
|
var b2 B2 = &T2{}
|