1.0.0-alpha.2

CHANGES:

This prerelease includes some bug fixes:

• Plugged a memory leak in the implementation of callcc.
• Fixed a bug in the implementation of callcc which would occur
  whenever the capture continuation would escape the scope of its
  binding occurrence without being invoked at least once.
• Renamed the C operator resume to throw.
• Slightly generalised the type of C's throw operator.