mirror of
https://github.com/golang/go
synced 2024-10-01 05:38:32 -06:00
429d1e0155
When being used by the compiler, augment the types2 missing method message with extra info, if a method is missing, but a method with the correct name except for case (i.e. equal via string.EqualFold()) is present. In that case, print out the wanted method and the method that is present (that has the wrong case). In the 1.17 compiler, we don't do this case-folding check when assigning an interface to an interface, so I didn't add that check, but we could add that. Fixes #48471 Change-Id: Ic54549c1f66297c9221d979d49c1daa719aa66cd Reviewed-on: https://go-review.googlesource.com/c/go/+/363437 Trust: Dan Scales <danscales@google.com> Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
42 lines
1.8 KiB
Go
42 lines
1.8 KiB
Go
// errorcheck
|
|
|
|
// Copyright 2021 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.
|
|
|
|
package p
|
|
|
|
type I interface{ M(int) }
|
|
|
|
type T struct{}
|
|
|
|
type T2 struct{}
|
|
|
|
func (*T2) m(int)
|
|
|
|
type T3 struct{}
|
|
|
|
func (*T3) M(string) {}
|
|
|
|
type T4 struct{}
|
|
|
|
func (*T4) M(int)
|
|
|
|
func f(I)
|
|
|
|
func g() {
|
|
f(new(T)) // ERROR "cannot use new\(T\) \(.*type \*T\) as type I in argument to f:\n\t\*T does not implement I \(missing M method\)"
|
|
var i I
|
|
i = new(T) // ERROR "cannot use new\(T\) \(.*type \*T\) as type I in assignment:\n\t\*T does not implement I \(missing M method\)"
|
|
i = I(new(T)) // ERROR "cannot convert new\(T\) \(.*type \*T\) to type I:\n\t\*T does not implement I \(missing M method\)"
|
|
i = new(T2) // ERROR "cannot use new\(T2\) \(.*type \*T2\) as type I in assignment:\n\t\*T2 does not implement I \(missing M method\)\n\t\thave m\(int\)\n\t\twant M\(int\)"
|
|
i = new(T3) // ERROR "cannot use new\(T3\) \(.*type \*T3\) as type I in assignment:\n\t\*T3 does not implement I \(wrong type for M method\)\n\t\thave M\(string\)\n\t\twant M\(int\)"
|
|
i = T4{} // ERROR "cannot use T4\{\} \(.*type T4\) as type I in assignment:\n\tT4 does not implement I \(M method has pointer receiver\)"
|
|
i = new(I) // ERROR "cannot use new\(I\) \(.*type \*I\) as type I in assignment:\n\t\*I does not implement I \(\*I is pointer to interface, not interface\)"
|
|
_ = i.(*T2) // ERROR "impossible type assertion: i.\(\*T2\)\n\t\*T2 does not implement I \(missing M method\)\n\t\thave m\(int\)\n\t\twant M\(int\)"
|
|
_ = i.(*T3) // ERROR "impossible type assertion: i.\(\*T3\)\n\t\*T3 does not implement I \(wrong type for M method\)\n\t\thave M\(string\)\n\t\twant M\(int\)"
|
|
var t *T4
|
|
t = i // ERROR "cannot use i \(variable of type I\) as type \*T4 in assignment:\n\tneed type assertion"
|
|
_ = i
|
|
}
|