compiler(message)
Return a function for emitting code for one of the basic constructs of the Slogan language. Message
must be one of the symbols: 'function_, 'call,
'let_, 'letfn_, 'letrec_,
'named_let, 'let_statement,
'if_, 'if_multi, 'when_,
'case_, 'assignment and
'let_bindings_parser.