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go/test/mainsig.go
Russ Cox be64c8bece [dev.regabi] cmd/compile: cleanup for concrete types - noder
An automated rewrite will add concrete type assertions after
a test of n.Op(), when n can be safely type-asserted
(meaning, n is not reassigned a different type, n is not reassigned
and then used outside the scope of the type assertion,
and so on).

This sequence of CLs handles the code that the automated
rewrite does not: adding specific types to function arguments,
adjusting code not to call n.Left() etc when n may have multiple
representations, and so on.

This CL focuses on noder.go.

Passes buildall w/ toolstash -cmp.

Change-Id: Ie870126b51558e83c738add8e91a2804ed6d7f92
Reviewed-on: https://go-review.googlesource.com/c/go/+/277931
Trust: Russ Cox <rsc@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
2020-12-17 04:43:46 +00:00

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Go

// errorcheck
// 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(int) {} // ERROR "func main must have no arguments and no return values"
func main() int { return 1 } // ERROR "func main must have no arguments and no return values" "main redeclared in this block"
func init(int) {} // ERROR "func init must have no arguments and no return values"
func init() int { return 1 } // ERROR "func init must have no arguments and no return values"