Agnostic Lizard is a portable implementation of a code walker and in
particular of the macroexpand-all function (and macro) that makes a best
effort to be correct while not expecting much beyond what the Common Lisp
standard requires.

It aims to be implementation-agnostic and to climb the syntax trees.

Alternatives: 
  macroexpand-dammit (only macroexpansion, removes macrolet),
  hu.dwim.walker (significant implementation-specific code, not all
implementation support up to date, removes macrolet),
  trivial-macroexpand-all (only macroexpansion, maximally
implementation-specific but supports a lot of implementations),
  swank (implementation-specific but supports a lot of implementations, no code
walker)
