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main redeclared in this block #29881

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fengpf opened this issue Jan 23, 2019 · 3 comments
Closed

main redeclared in this block #29881

fengpf opened this issue Jan 23, 2019 · 3 comments
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@fengpf
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fengpf commented Jan 23, 2019

Please answer these questions before submitting your issue. Thanks!

What did you do?

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.

What did you expect to see?

What did you see instead?

System details

go version go1.11.1 darwin/amd64
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/fpf/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/data/app/go"
GOPROXY=""
GORACE=""
GOROOT="/data/app/go/src/go1.11.1"
GOTMPDIR=""
GOTOOLDIR="/data/app/go/src/go1.11.1/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
GOROOT/bin/go version: go version go1.11.1 darwin/amd64
GOROOT/bin/go tool compile -V: compile version go1.11.1
uname -v: Darwin Kernel Version 17.6.0: Tue May  8 15:22:16 PDT 2018; root:xnu-4570.61.1~1/RELEASE_X86_64
ProductName:	Mac OS X
ProductVersion:	10.13.5
BuildVersion:	17F77
lldb --version: lldb-902.0.79.7
  Swift-4.1
gdb --version: GNU gdb (GDB) 8.1.1

When i create new file named test.go in the src/cmd/compile, then i execute go run main.go test.go, i got err :
./test.go:3:6: main redeclared in this block
previous declaration at ./main.go:40:6
@ianlancetaylor
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What is on line 3 of test.go and line 40 of main.go?

@fengpf
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fengpf commented Jan 23, 2019 •
edited

on line 3 of test.go: func main() {
println("hello")
}

on line 40 of main.go: func main() {
// disable timestamps for reproducible output
log.SetFlags(0)
log.SetPrefix("compile: ")

archInit, ok := archInits[objabi.GOARCH]
if !ok {
	fmt.Fprintf(os.Stderr, "compile: unknown architecture %q\n", objabi.GOARCH)
	os.Exit(2)
}

gc.Main(archInit)
gc.Exit(0)

}

@ianlancetaylor
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ianlancetaylor commented Jan 23, 2019 •
edited

You have two defined the function main in two different places. That is what the error message is telling you. This is not a bug.

If you have questions about how to use Go I encourage you to use a forum rather than the bug tracker. Please see https://golang.org/wiki/Questions. Thanks.

@golang golang locked and limited conversation to collaborators Jan 23, 2020
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@ianlancetaylor @gopherbot @fengpf