What version of Go are you using (go version)?

$ go version
go version go1.14.4 linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/fishy/.cache/go-build"
GOENV="/home/fishy/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/fishy/.gopath"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
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-build661038676=/tmp/go-build -gno-record-gcc-switches"

What did you do?

This is the minimal sequence of commands to reproduce the issue:

fishy@muto:~/work/tmp$ ls
main.go
fishy@muto:~/work/tmp$ cat main.go
package main

import "fmt"

func main() {
        fmt.Println("vim-go")
}
fishy@muto:~/work/tmp$ go test
?       _/home/fishy/work/tmp   [no test files]
fishy@muto:~/work/tmp$ mkdir foo.go
fishy@muto:~/work/tmp$ go test
?       _/home/fishy/work/tmp   [no test files]
fishy@muto:~/work/tmp$ ln -s foo.go bar.go
fishy@muto:~/work/tmp$ go test
can't load package: package .: read /home/fishy/work/tmp/bar.go: read /home/fishy/work/tmp/bar.go: is a directory
fishy@muto:~/work/tmp$ ls -l
total 8
lrwxrwxrwx 1 fishy fishy    6 Jun 24 16:32 bar.go -> foo.go
drwxr-xr-x 2 fishy fishy 4096 Jun 24 16:32 foo.go
-rw-r--r-- 1 fishy fishy   67 Jun 24 16:32 main.go

What did you expect to see?

go toolchain should ignore bar.go as it's a symlink to a directory, similar to how they ignored foo.go before.

What did you see instead?

go toolchain throws error.