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go/test/typeparam/typeswitch4.go
Keith Randall ca3c6985cd [dev.typeparams] cmd/compile: implement generic type switches
Add a new dynamicType node, which is used as a case entry when
the type being switched to is generic.

Change-Id: Ice77c6f224b8fdd3ff574fdf4a8ea5f6c7ddbe75
Reviewed-on: https://go-review.googlesource.com/c/go/+/339429
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
2021-08-09 18:41:45 +00:00

34 lines
638 B
Go

// run -gcflags=-G=3
// 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 main
type I interface { foo() int }
type myint int
func (x myint) foo() int {return int(x)}
type myfloat float64
func (x myfloat) foo() int {return int(x)}
type myint32 int32
func (x myint32) foo() int { return int(x) }
func f[T I](i I) {
switch x := i.(type) {
case T, myint32:
println("T/myint32", x.foo())
default:
println("other", x.foo())
}
}
func main() {
f[myfloat](myint(6))
f[myfloat](myfloat(7))
f[myfloat](myint32(8))
}