mirror of
https://github.com/golang/go
synced 2024-11-18 05:54:49 -07:00
e24977d231
The next CL will remove the -G flag, effectively hard-coding it to its current default (-G=3). Change-Id: Ib4743b529206928f9f1cca9fdb19989728327831 Reviewed-on: https://go-review.googlesource.com/c/go/+/388534 Reviewed-by: Keith Randall <khr@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
84 lines
1.7 KiB
Go
84 lines
1.7 KiB
Go
// run
|
|
|
|
// 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.
|
|
|
|
// Test that we can convert type parameters to both empty
|
|
// and nonempty interfaces, and named and nonnamed versions
|
|
// thereof.
|
|
|
|
package main
|
|
|
|
import "fmt"
|
|
|
|
type E interface{}
|
|
|
|
func f[T any](x T) interface{} {
|
|
var i interface{} = x
|
|
return i
|
|
}
|
|
|
|
func fs[T any](x T) interface{} {
|
|
y := []T{x}
|
|
var i interface{} = y
|
|
return i
|
|
}
|
|
|
|
func g[T any](x T) E {
|
|
var i E = x
|
|
return i
|
|
}
|
|
|
|
type C interface {
|
|
foo() int
|
|
}
|
|
|
|
type myInt int
|
|
|
|
func (x myInt) foo() int {
|
|
return int(x + 1)
|
|
}
|
|
|
|
func h[T C](x T) interface{ foo() int } {
|
|
var i interface{ foo() int } = x
|
|
return i
|
|
}
|
|
func i[T C](x T) C {
|
|
var i C = x // conversion in assignment
|
|
return i
|
|
}
|
|
|
|
func j[T C](t T) C {
|
|
return C(t) // explicit conversion
|
|
}
|
|
|
|
func js[T any](x T) interface{} {
|
|
y := []T{x}
|
|
return interface{}(y)
|
|
}
|
|
|
|
func main() {
|
|
if got, want := f[int](7), 7; got != want {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := fs[int](7), []int{7}; got.([]int)[0] != want[0] {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := g[int](7), 7; got != want {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := h[myInt](7).foo(), 8; got != want {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := i[myInt](7).foo(), 8; got != want {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := j[myInt](7).foo(), 8; got != want {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
if got, want := js[int](7), []int{7}; got.([]int)[0] != want[0] {
|
|
panic(fmt.Sprintf("got %d want %d", got, want))
|
|
}
|
|
}
|