Error downloading Golang libraries from VSCode

Question

By running the following command in cmd or vscode:

go get -u -v github.com/mdempsky/gocode

I received the following console error:

crypto/internal/cipherhw
crypto/rc4
runtime
# crypto/rc4
c:\go\src\crypto\rc4\rc4_asm.go:13:18: (*Cipher).XORKeyStream redeclared 
in this block
previous declaration at c:\go\src\crypto\rc4\rc4.go:61:6

I have already checked the GOPATH, and GOROOT. I also uninstalled and installed go and VSCode again and was unsuccessful.

You have a corrupt Go installation. As part of issue 25417 the assembly rc4 implementation was removed. You probably have a left over rc4_asm.go file from a previous version of Go. You should completly/cleanly uninstall Go and re-install Go. — Dave C
– Dave C, Commented Aug 21, 2019 at 14:31

Taylor Belland · Accepted Answer · 2019-08-21 06:12:11Z

1

This is a declaration error, if you inspect the error code you can fix it yourself.

crypto\rc4\rc4_asm.go:13:18: (*Cipher).XORKeyStream redeclared in this block

previous declaration at c:\go\src\crypto\rc4\rc4.go:61:6

The first line states that (*Cipher).XORKeyStream was redeclared on line 13 of the file rc4_asm.go

So if you inspect the rc4.go, file at line 61, you will find that (*Cipher).XORKeyStream has been defined more than once. Keep the definition you need, and go build again.

I should note that one of the steps of go getting is a go build, so you don't have to worry about re-downloading again and again.

I would try removing the download and trying again however, I managed to use that command and got an error free build.

answered Aug 21, 2019 at 6:12

Taylor Belland

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1 Comment

Dave C Over a year ago

"Keep the definition you need, and go build again" is bad advice; this is part of the Go standard library and a build failure there suggests a corrupt Go installation.

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