path/filepath: TestEvalSymlinks tests with "/" prefix fail in Windows

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

go version go1.10.1 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 GOHOSTARCH=amd64 set GOHOSTOS=windows set GOOS=windows

What did you do?

Built go using "all.bat"

What did you expect to see?

while running tests ok path/filepath x.xxxs

What did you see instead?

--- FAIL: TestEvalSymlinks (0.04s) path_test.go:798: EvalSymlinks("C:\Users\varga\AppData\Local\Temp\evalsymlink400713581\test/linkabs") returns "C:\", want "/" FAIL FAIL path/filepath 1.552s

I have a code fix for this if this. Essentially just prepending the expected result with the volume name if we are on Windows and the path has a prefix of "/".

Does that sound reasonable?