Missing `impl<'a> PartialEq<&'a str> for OsString`

[Kixunil]

I've just got very surprised to find out that my_os_string == "foo" doesn't compile, but my_os_string == *"foo" does. After some investigation, I found that impl<'a> PartialEq<&'a str> for OsString is missing. Similar impl is present for String though.

I believe it'd be nice to implement it.

[csmoe]

&OsStr is to OsString as &str is to String, so check out impl<'a, 'b> PartialEq<&'a OsStr> for OsString, this implementation might meet your needs.

[Kixunil]

@csmoe I've soled my problem immediately. I filed issue because I think we could help others by implementing the trait.