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cmd/compile: stenciled conversions might be NOPs
A generic conversion might be required for when converting T->interface{}. When stenciled with T=interface{}, then that conversion doesn't need to do anything. Fixes #48276 Change-Id: Ife65d01c99fbd0895cb7eec79df9e93e752b1fa5 Reviewed-on: https://go-review.googlesource.com/c/go/+/348736 Trust: Keith Randall <khr@golang.org> Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Go Bot <gobot@golang.org>
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// run -gcflags=-G=3 | ||
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// 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. | ||
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package main | ||
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import "fmt" | ||
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func main() { | ||
IsZero[interface{}]("") | ||
} | ||
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func IsZero[T comparable](val T) bool { | ||
var zero T | ||
fmt.Printf("%v:%v\n", zero, val) | ||
return val != zero | ||
} |
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<nil>: |
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// run -gcflags=-G=3 | ||
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// 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. | ||
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package main | ||
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func main() { | ||
f[interface{}](nil) | ||
} | ||
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func f[T any](x T) { | ||
var _ interface{} = x | ||
} |