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[dev.typeparams] cmd/compile/internal/types2: report error for invalid main function signature

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Updates #43308.

Change-Id: I2caff83f304c7e104edda76ac3623cce9fc94a8d
Reviewed-on: https://go-review.googlesource.com/c/go/+/279552
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Robert Griesemer 2020-12-21 16:48:58 -08:00
parent 53c4c17b09
commit 41e7901ca4
4 changed files with 22 additions and 6 deletions
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11
src/cmd/compile/internal/types2/resolver.go
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@ -397,15 +397,16 @@ func (check *Checker) collectObjects() {
obj := NewFunc(d.Name.Pos(), pkg, name, nil)
if d.Recv == nil {
// regular function
if name == "init" {
if name == "init" || name == "main" && pkg.name == "main" {
if d.TParamList != nil {
//check.softErrorf(d.TParamList.Pos(), "func init must have no type parameters")
check.softErrorf(d.Name, "func init must have no type parameters")
check.softErrorf(d, "func %s must have no type parameters", name)
}
if t := d.Type; len(t.ParamList) != 0 || len(t.ResultList) != 0 {
check.softErrorf(d, "func init must have no arguments and no return values")
check.softErrorf(d, "func %s must have no arguments and no return values", name)
}
// don't declare init functions in the package scope - they are invisible
}
// don't declare init functions in the package scope - they are invisible
if name == "init" {
obj.parent = pkg.scope
check.recordDef(d.Name, obj)
// init functions must have a body

7
src/cmd/compile/internal/types2/testdata/main.go2 vendored Normal file
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@ -0,0 +1,7 @@
// Copyright 2020 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 /* ERROR "func main must have no type parameters" */ main[T any]() {}

9
src/cmd/compile/internal/types2/testdata/main.src vendored Normal file
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@ -0,0 +1,9 @@
// Copyright 2020 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 main()
func /* ERROR "no arguments and no return values" */ main /* ERROR redeclared */ (int)
func /* ERROR "no arguments and no return values" */ main /* ERROR redeclared */ () int

1
test/run.go
View File

@ -1936,7 +1936,6 @@ var excluded = map[string]bool{
"import6.go": true, // issue #43109
"initializerr.go": true, // types2 reports extra errors
"linkname2.go": true, // error reported by noder (not running for types2 errorcheck test)
"mainsig.go": true, // issue #43308
"shift1.go": true, // issue #42989
"switch4.go": true, // error reported by noder (not running for types2 errorcheck test)
"typecheck.go": true, // invalid function is not causing errors when called