net/url: Parsing of absolute Windows filepaths without scheme

[JaCoB1123]

Parsing a Windows filepath without scheme yields an invalid url:
Examples: https://play.golang.org/p/QuBFiU_1b1

# Working when prefixed with file:///
file:///c:\foo\bar
Scheme: file
Host: 
Path: /c:\foo\bar

file:///c:/foo/bar
Scheme: file
Host: 
Path: /c:/foo/bar

# Not working with only 2 leading slashes
file://c:\foo\bar
Scheme: file
Host: c:\foo\bar
Path: 

# Host containing colon but without port should not be valid?
file://c:/foo/bar
Scheme: file
Host: c:
Path: /foo/bar

# Expected: Scheme: empty, Path: input
c:\foo\bar
Scheme: c
Host: 
Path: 

# Expected: Scheme: empty, Path: input
c:/foo/bar
Scheme: c
Host: 
Path: /foo/bar

The middle two tests aren't real bugs though, I guess.

[bradfitz]

The net/url package parses URLs, not file paths. Windows has nothing to do with this.

Working as intended.