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cmd/compile: accept string|[]byte-constrained 2nd argument in append
Similarly to what we do for the built-in function `copy`, where we allow a string as 2nd argument to append, also permit a type parameter constrained by string|[]byte. While at it, change date in the manual.go2 test files so that we don't need to constantly correct it when copying a test case from that file into a proper test file. Fixes #50281. Change-Id: I23fed66736aa07bb3c481fe97313e828425ac448 Reviewed-on: https://go-review.googlesource.com/c/go/+/376214 Trust: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
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@ -101,7 +101,7 @@ func (check *Checker) builtin(x *operand, call *syntax.CallExpr, id builtinId) (
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if x.mode == invalid {
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return
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}
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if allString(x.typ) {
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if t := structuralString(x.typ); t != nil && isString(t) {
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if check.Types != nil {
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sig := makeSig(S, S, x.typ)
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sig.variadic = true
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26
src/cmd/compile/internal/types2/testdata/fixedbugs/issue50281.go2
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26
src/cmd/compile/internal/types2/testdata/fixedbugs/issue50281.go2
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@ -0,0 +1,26 @@
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// Copyright 2022 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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package p
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func _[S string | []byte](s S) {
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var buf []byte
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_ = append(buf, s...)
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}
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func _[S ~string | ~[]byte](s S) {
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var buf []byte
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_ = append(buf, s...)
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}
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// test case from issue
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type byteseq interface {
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string | []byte
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}
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// This should allow to eliminate the two functions above.
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func AppendByteString[source byteseq](buf []byte, s source) []byte {
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return append(buf, s[1:6]...)
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}
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@ -1,4 +1,4 @@
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// Copyright 2021 The Go Authors. All rights reserved.
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// Copyright 2022 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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@ -102,7 +102,7 @@ func (check *Checker) builtin(x *operand, call *ast.CallExpr, id builtinId) (_ b
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if x.mode == invalid {
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return
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}
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if allString(x.typ) {
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if t := structuralString(x.typ); t != nil && isString(t) {
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if check.Types != nil {
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sig := makeSig(S, S, x.typ)
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sig.variadic = true
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26
src/go/types/testdata/fixedbugs/issue50281.go2
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26
src/go/types/testdata/fixedbugs/issue50281.go2
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@ -0,0 +1,26 @@
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// Copyright 2022 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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package p
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func _[S string | []byte](s S) {
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var buf []byte
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_ = append(buf, s...)
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}
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func _[S ~string | ~[]byte](s S) {
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var buf []byte
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_ = append(buf, s...)
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}
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// test case from issue
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type byteseq interface {
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string | []byte
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}
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// This should allow to eliminate the two functions above.
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func AppendByteString[source byteseq](buf []byte, s source) []byte {
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return append(buf, s[1:6]...)
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}
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2
src/go/types/testdata/manual.go2
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2
src/go/types/testdata/manual.go2
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@ -1,4 +1,4 @@
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// Copyright 2021 The Go Authors. All rights reserved.
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// Copyright 2022 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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20
test/typeparam/issue376214.go
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20
test/typeparam/issue376214.go
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@ -0,0 +1,20 @@
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// run -gcflags=-G=3
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// Copyright 2022 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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package main
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func add[S ~string | ~[]byte](buf *[]byte, s S) {
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*buf = append(*buf, s...)
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}
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func main() {
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var buf []byte
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add(&buf, "foo")
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add(&buf, []byte("bar"))
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if string(buf) != "foobar" {
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panic("got " + string(buf))
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}
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}
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