path/filepath: EvalSymlinks(".") and EvalSymlinks("C:.") return different output on Windows

[hirochachacha]

Please answer these questions before submitting your issue. Thanks!

1. What version of Go are you using (go version)?
   go version go1.6.3 windows/amd64
2. What operating system and processor architecture are you using (go env)?
   set GOARCH=amd64
   set GOBIN=
   set GOEXE=.exe
   set GOHOSTARCH=amd64
   set GOHOSTOS=windows
   set GOOS=windows
   set GOPATH=C:\Users\Hiroshi\go
   set GORACE=
   set GOROOT=C:\Go
   set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
   set GO15VENDOREXPERIMENT=1
   set CC=gcc
   set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0
   set CXX=g++
   set CGO_ENABLED=1
3. 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.

package main

import (
        "fmt"
        "os"
        "path/filepath"
)

func main() {
        err := os.Symlink(`../..`, "link")
        if err != nil {
                panic(err)
        }

        err = os.Chdir("link")
        if err != nil {
                panic(err)
        }

        path, err := filepath.EvalSymlinks(".")
        if err != nil {
                panic(err)
        }

        fmt.Printf(`EvalSymlinks(".") = %q`+"\n", path)

        path, err = filepath.EvalSymlinks("C:.")
        if err != nil {
                panic(err)
        }

        fmt.Printf(`EvalSymlinks("C:.") = %q`+"\n", path)

        err = os.Chdir("..")
        if err != nil {
                panic(err)
        }

        os.Remove("link")
}

1. What did you expect to see?
   EvalSymlinks(".") = "."
   EvalSymlinks("C:.") = "C:."
2. What did you see instead?
   EvalSymlinks(".") = "."
   EvalSymlinks("C:.") = "C:...."

[alexbrainman]

@hirochachacha do you plan to fix this yourself?

Alex

[hirochachacha]

Yes I will.

[gopherbot]

CL https://golang.org/cl/28214 mentions this issue.