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https://github.com/golang/go
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8070e70d64
With this change, we shall now see:
*myS does not implement S (wrong type for DoSomething method)
have DoSomething() (string, error) at ./main.go:9:14
want DoSomething() (int, error)
instead of previously:
*myS does not implement S (wrong type for DoSomething method)
have DoSomething() (string, error)
want DoSomething() (int, error)
Fixes #42841
Fixes #45813
Change-Id: I66990929e39b0d36f2e91da0d92f60586a9b84e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/373634
Trust: Robert Findley <rfindley@google.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
42 lines
1.9 KiB
Go
42 lines
1.9 KiB
Go
// errorcheck -G=3
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package p
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type I interface{ M(int) }
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type T struct{}
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type T2 struct{}
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func (*T2) m(int)
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type T3 struct{}
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func (*T3) M(string) {}
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type T4 struct{}
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func (*T4) M(int)
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func f(I)
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func g() {
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f(new(T)) // ERROR "cannot use new\(T\) \(.*type \*T\) as type I in argument to f:\n\t\*T does not implement I \(missing M method\)"
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var i I
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i = new(T) // ERROR "cannot use new\(T\) \(.*type \*T\) as type I in assignment:\n\t\*T does not implement I \(missing M method\)"
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i = I(new(T)) // ERROR "cannot convert new\(T\) \(.*type \*T\) to type I:\n\t\*T does not implement I \(missing M method\)"
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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\(int\) at \w+.+\d.\d+\n\t\twant M\(int\)"
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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\(string\) at \w+.+\d.\d+\n\t\twant M\(int\)"
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i = T4{} // ERROR "cannot use T4\{\} \(.*type T4\) as type I in assignment:\n\tT4 does not implement I \(M method has pointer receiver\)"
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i = new(I) // ERROR "cannot use new\(I\) \(.*type \*I\) as type I in assignment:\n\t\*I does not implement I \(type \*I is pointer to interface, not interface\)"
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_ = i.(*T2) // ERROR "impossible type assertion: i.\(\*T2\)\n\t\*T2 does not implement I \(missing M method\)\n\t\thave m\(int\) at \w+.+\d.\d+\n\t\twant M\(int\)"
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_ = i.(*T3) // ERROR "impossible type assertion: i.\(\*T3\)\n\t\*T3 does not implement I \(wrong type for M method\)\n\t\thave M\(string\) at \w+.+\d.\d+\n\t\twant M\(int\)"
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var t *T4
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t = i // ERROR "cannot use i \(variable of type I\) as type \*T4 in assignment:\n\tneed type assertion"
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_ = i
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}
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