rust-lang/rust — pull request #16512 by wickerwaka (2014-08-15 05:45:43+00:00)
Title: Change how libgetopts parse arguments without whitespace

I don't know if anything else was relying on the old behavior, this seems more correct.

Fixes #16348

If '-F' is allowed to have an optional argument, with the previous version '-FF' would be translated to '-F -F'. In this new version '-FF' translates to '-F' with argument 'F'