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5355753009
We don't usually reformat the test directory, but all of the files in test/typeparam are syntactically valid. I suspect the misformattings here are because developers aren't re-installing gofmt with -tags=typeparams, not intentionally exercising non-standard formatting. Change-Id: I3767d480434c19225568f3c7d656dc8589197183 Reviewed-on: https://go-review.googlesource.com/c/go/+/338093 Trust: Matthew Dempsky <mdempsky@google.com> Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Griesemer <gri@golang.org>
84 lines
1.7 KiB
Go
84 lines
1.7 KiB
Go
// run -gcflags=-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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// Test that we can convert type parameters to both empty
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// and nonempty interfaces, and named and nonnamed versions
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// thereof.
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package main
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import "fmt"
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type E interface{}
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func f[T any](x T) interface{} {
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var i interface{} = x
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return i
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}
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func fs[T any](x T) interface{} {
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y := []T{x}
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var i interface{} = y
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return i
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}
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func g[T any](x T) E {
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var i E = x
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return i
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}
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type C interface {
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foo() int
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}
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type myInt int
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func (x myInt) foo() int {
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return int(x + 1)
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}
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func h[T C](x T) interface{ foo() int } {
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var i interface{ foo() int } = x
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return i
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}
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func i[T C](x T) C {
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var i C = x // conversion in assignment
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return i
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}
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func j[T C](t T) C {
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return C(t) // explicit conversion
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}
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func js[T any](x T) interface{} {
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y := []T{x}
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return interface{}(y)
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}
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func main() {
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if got, want := f[int](7), 7; got != want {
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panic(fmt.Sprintf("got %d want %d", got, want))
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}
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if got, want := fs[int](7), []int{7}; got.([]int)[0] != want[0] {
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panic(fmt.Sprintf("got %d want %d", got, want))
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}
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if got, want := g[int](7), 7; got != want {
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panic(fmt.Sprintf("got %d want %d", got, want))
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}
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if got, want := h[myInt](7).foo(), 8; got != want {
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panic(fmt.Sprintf("got %d want %d", got, want))
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}
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if got, want := i[myInt](7).foo(), 8; got != want {
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panic(fmt.Sprintf("got %d want %d", got, want))
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}
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if got, want := j[myInt](7).foo(), 8; got != want {
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panic(fmt.Sprintf("got %d want %d", got, want))
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}
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if got, want := js[int](7), []int{7}; got.([]int)[0] != want[0] {
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panic(fmt.Sprintf("got %d want %d", got, want))
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}
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}
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