Using / in a case/when

[manveru]

This simple example fails to compile with Syntax error in :3: unexpected token: DELIMITER_START CLOSE.

case a
  when b
    1 / 1
end

Version: Crystal 0.20.5 (2017-01-27)
OS: NixOS

[dylandrop]

https://github.com/crystal-lang/crystal/blob/master/src/compiler/crystal/syntax/parser.cr#L2314 and the related slash_is_regex! calls appear to be the offender. Seems like this might require somewhat of a larger change to the parse_case method.