gistfile1.txt

rbx-1.0.0-rc2 > "not(false\n1)".to_ast.ascii_graph Not
  @line: 2
  @value: \
  Block
    @line: 1
    @array: \
      False
        @line: 1
      FixnumLiteral
        @line: 2
        @value: 1

rbx-1.0.0-rc2 > "not(false;1)".to_ast.ascii_graphNot
  @line: 1
  @value: \
  Block
    @line: 1
    @array: \
      False
        @line: 1
      FixnumLiteral
        @line: 1
        @value: 1

# Now here's the weird part.

rbx-1.0.0-rc2 > "puts(false;1)".to_ast
SyntaxError: (eval):1: expecting ')'
   from Rubinius::Melbourne#syntax_error at lib/melbourne.rb:52

# Guess it's because not() is actually a keyword, handled by the lexer, which is a little bit dumber than normal method call semantics...

http://github.com/ruby/ruby/blob/trunk/lex.c.blt#L131

Cool.