go: os: IsDir doesn't work with Windows OneDrive

I think there is an issue with FileInfo.IsDir in Windows 10 using the new Files On-Demand feature of OneDrive. (This occurs only after the Fall Creator Update that introduce this feature).

If I create a folder in OneDrive (with the Files-On-Demand feature on) IsDir return false. Note that just after the creation it return true but once OneDrive finish its sync it then return false. Also if I deactivate the Files-On-Demand feature I no longer repro (for newly created folder, the old one still have the issue). Using the “Always keep on the device option” or the “Free up space” doesn’t change the repro.

Also I may miss something obvious, I never used Go before but I found this issue while debugging and issue with Hugo (a site generator in Go).

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

go version go1.9.2 windows/amd64

Does this issue reproduce with the latest release?

Yes

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\theo\go
set GORACE=
set GOROOT=C:\Go
set GOTOOLDIR=C:\Go\pkg\tool\windows_amd64
set GCCGO=gccgo
set CC=gcc
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0
set CXX=g++
set CGO_ENABLED=1
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config

My OneDrive version is: Version 2017 (Build 17.3.7105.1024)

What did you do?

package main

import (
	"fmt"
	"os"
)

func main() {
	src := "C:\\Users\\theo\\folder"
	srcO := "C:\\Users\\theo\\OneDrive\\folder"
	fi, err := os.Stat(src)
	fmt.Println(fi.IsDir())
	fmt.Println(err)

	fiO, errO := os.Stat(srcO)
	fmt.Println(fiO.IsDir())
	fmt.Println(errO)
}

What did you expect to see?

true
<nil>
true
<nil>

What did you see instead?

true
<nil>
**false**
<nil>