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go/test/typeparam/issue49309.go
Dan Scales 6ba68a0581 cmd/compile: don't inline fn with no shape params, but passed a shape arg
Don't inline a function fn that has no shape parameters, but is passed
at least one shape arg. This means we must be inlining a non-generic
function fn that was passed into a generic function, and can be called
with a shape arg because it matches an appropriate type parameter. But
fn may include an interface conversion (that may be applied to a shape
arg) that was not apparent when we first created the instantiation of
the generic function. We can't handle this if we actually do the
inlining, since we want to know all interface conversions immediately
after stenciling.  So, we avoid inlining in this case.

Fixes #49309.

Change-Id: I7b8ab7b13e58fdb0111db91bc92a91d313f7c2c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/361260
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Dan Scales <danscales@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2021-11-04 15:43:59 +00:00

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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
func genfunc[T any](f func(c T)) {
var r T
f(r)
}
func myfunc(c string) {
test2(c)
}
//go:noinline
func test2(a interface{}) {
}
func main() {
genfunc(myfunc)
}