Grammar coverage checklist

[smashwilson]

This is a master list of the grammar constructs that need representation in the AST.

• Statement lists.
• Integer literals.
• Float literals.
• Strings.
• Symbols.
• Regular expressions.
• Blocks.
• ...with parameters.
• Default block parameters.
• Assignment.
• Temporary variables.
• Instance variables.
• Binary operators.
• ... ANDLIKE.
• ... ORLIKE.
• ... PLUSLIKE.
• ... MINUSLIKE.
• ... MULTLIKE.
• ... DIVLIKE.
• ... MODLIKE.
• ... EXPLIKE.
• NOT unary operator.
• method calls:
• ...with implicit receiver.
• ...with explicit receiver.
• ...comma-separated argument lists
• ...space-separated argument lists

Concepts that haven't made it in to the lexer or grammar yet, and general cleanup.

• String interpolation.
• Parallel assignment.
• Varargs and kwargs.
• Unary minus.
• Flatten invocation into expr.