Lexer
	UTF-8.
	valid chars
	how it tokenizes, link to source.
Languages
	General
		Functionality for operators.
		Special operators:
			"" as funcall infix operator.
			" " as multiplication infix operator.
		Describe what Assoc is.
	L1
		Operators, fetch from OPLs/L1.c , add Assoc links.
		Quoting
			with gaps
			without gaps
		make `...` use the tokenizer but ignore whitespace (for example for SQL), result: list.
		make '...' use the tokenizer and make sure to add gaps, result: expression.
		FIXME Provide a way to escape the quote char.