GoRun errors out with 'no packages loaded from `/path/filename.go`

[mfrw]

What did you do? (required: The issue will be closed when not provided)

I ran :GoRun in a test hello world with main.

package main

import "fmt"

func main() {
        fmt.Println("vim-go")
}

I tried to run :GoRun on this program.

What did you expect to happen?

Print vim-go

What happened instead?

:!'go' 'run' '/home/mfrw/mariner-org/dashboard/cmd/test/main.go\\n'  2>&1| tee /tmp/nvim7Egq2g/6                                                                                                                                                                     
go run: no packages loaded from /home/mfrw/mariner-org/dashboard/cmd/test/main.go\n

Configuration (MUST fill this out):

vim-go version:

vimrc you used to reproduce:

vimrc

call plug#begin('~/.vim/bundle')
Plug 'fatih/vim-go', { 'do': ':GoUpdateBinaries' }
call plug#end()

au FileType go nmap <leader>r <Plug>(go-run)

Vim version (first three lines from :version):

NVIM v0.6.0-dev

Go version (go version):

go version go1.17.1 linux/amd64

Go environment

go env Output:

GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/mfrw/.cache/go-build"
GOENV="/home/mfrw/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/mfrw/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/mfrw/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/lib/go-1.17"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/go-1.17/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.17.1"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/mfrw/mariner-org/dashboard/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build470378468=/tmp/go-build -gno-record-gcc-switches"

gopls version

gopls version Output:

golang.org/x/tools/gopls v0.7.2
    golang.org/x/tools/gopls@v0.7.2 h1:kRKKdvA8GOzra8rhSFDClOR7hV/x8v0J0Vm4C/gWq8s=

Although with the same .vimrc i am able to run this everywhere else.
If anyone could please point me towards any steps to debug this. I am not really sure what happend.

The only change I did it is upgrade go from 1.15 to 1.17.1 and it stopped working.

[bhcleek]

Why is there a literal \n at the end of main.go's filename?

[mfrw]

Why is there a literal \n at the end of main.go's filename?

:( I am not sure :(.
Let me try to find any specific reason for this :(
I am trying to find what in my config is causing this .. but Yes :(

Edit:

I changed my mapping to below and now it works as it does not add an additional new line.

au FileType go nmap <leader>r :GoRun % <CR>

What i am now wondering is

What went wrong with

au FileType go nmap <leader>r <Plug>(go-run)

I am not too well versed with vimscript.
The issue is mitigated. Should I close the issue or we dig more to find what caused this ?

[In anycase, thank you very much for the pointer, at least I am able to proceed. Appreciate the help]

[bhcleek]

au FileType go nmap <leader>r <Plug>(go-run) in my vimrc works fine for me: when I \r in main.go, it runs fine.

[mfrw]

au FileType go nmap <leader>r <Plug>(go-run) in my vimrc works fine for me: when I \r in main.go, it runs fine.

I am facing this issue only in one of my boxes. All other boxes that I have are running fine.
I am not sure what changed apart from me updating go-1.15 -> go-1.17. I touched nothing :(
Let me dig more though.
And probably this is just maybe something wrong with my env.

[sbatial]

I recently ran into the same error and I'm pretty sure I tracked it down!

Explanation:

The literal newline character appears to stem from the go#tool#Files() function.
Invoking :echo go#tool#Files() gives me ['<path-to-project>/main.go\n'].

So when one of the mappings

vim-go/ftplugin/go/mappings.vim

Lines 15 to 17 in 283b8db

	nnoremap <silent> <Plug>(go-run-vertical) :<C-u>call go#cmd#RunTerm(!g:go_jump_to_error, 'vsplit', [])<CR>
	nnoremap <silent> <Plug>(go-run-split) :<C-u>call go#cmd#RunTerm(!g:go_jump_to_error, 'split', [])<CR>
	nnoremap <silent> <Plug>(go-run-tab) :<C-u>call go#cmd#RunTerm(!g:go_jump_to_error, 'tabe', [])<CR>

calls go#cmd#RunTerm(!g:go_jump_to_error, 'split', []) which then invokes

vim-go/autoload/go/cmd.vim

Lines 123 to 125 in 00c5f2d

	if empty(a:files)
	call extend(cmd, go#tool#Files())
	else

Probable reason

While poking around in the go#tool#Files() function I saw that go#tool#Deps() handled the format string for go list a bit different than Files() and Imports().
I tested the Imports() function and it failed as well!

So I suspect that using {{printf \"\n\"}} only works on Windows whereas \n should be used on Linux/MacOS.

Possible fix

So to fix it I just changed the go#tool#Files() and the go#tool#Imports() function to use \n instead of {{printf \"\n\"}}.

That brought the 'run' commands as well as the 'Imports' command back to life again on my side (linux, nvim).

I opened a pull-request which should fix this: #3358