Rustc command line parser does not accept absolute Windows paths after -L

[vadimcn]

rustc foo.rs -LC:\some\directory
error: unknown codegen option: `:\some\directory`

This works, though: rustc foo.rs -L C:\some\directory

[wickerwaka]

This is not windows specific. Since '-C' is a valid option, libgetopts is not treating 'C' it as a the start of the value being specified for the '-L' option. I'm not sure if this is expected or desired functionality. IMO if an option has a mandatory or optional argument then anything after it should be treated as such.