[Rubygems-developers] Recent refactoring to remove Gem::Version::Requirement breaks with old cached gem files

[Chad Woolley]

Old cached gems contain marshalled referenced to
Gem::Version::Requirement in required_ruby_version.  This causes
breakages when they are unmarshalled with the new trunk code in which
this class has been removed.

Here is an example (see dependent-stubgem-1.0.0.gem):

http://github.com/thewoolleyman/geminstaller/tree/master/spec/fixture/gems/cache/