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

go version go1.10 linux/amd64

Does this issue reproduce with the latest release?

yes

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

GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"

What did you do?

create a very simple pakcage, try to append version number during compile time

src/dummy/main.go

package main

import "fmt"

var (
	version = "NONE"
)

func main() {
	fmt.Printf("Version is %s\n", version)
}

What did you expect to see?

since below command will run without any error:
go build -o bin/dummy -ldflags "-X main.version=1" dummy/ <- with /
it shall produce the same binary as by:
go build -o bin/dummy -ldflags "-X main.version=1" dummy <- without /

What did you see instead?

The "with /" case, version is not set by -ldflags "-X main.version=1"