anchor.diff:  matched_expr -> unary_op_eol matched_expr : build_unary_op('$1', '$2').
   matched_expr -> at_op_eol matched_expr : build_unary_op('$1', '$2').
   matched_expr -> bracket_at_expr : '$1'.
  -matched_expr -> fn_expr : '$1'.
  +matched_expr -> no_parens_expr : '$1'.
   
   unmatched_expr -> matched_expr op_expr : build_op(element(1, '$2'), '$1', element(2, '$2')).
   unmatched_expr -> unmatched_expr op_expr : build_op(element(1, '$2'), '$1', element(2, '$2')).
  
positive.code:   stab stab_eol stab_expr stab_maybe_expr
    kw_eol kw_expr kw_comma kw_base
    matched_kw_expr matched_kw_comma matched_kw_base
    dot_op dot_ref dot_identifier dot_op_identifier dot_do_identifier
    dot_paren_identifier dot_punctuated_identifier dot_bracket_identifier
    var list bracket_access bit_string tuple
    do_block fn_eol do_eol end_eol block_eol block_item block_list
  
negative.code: block_expr -> dot_do_identifier do_block : build_identifier('$1', '$2').
  block_expr -> dot_identifier call_args_no_parens_strict do_block : build_identifier('$1', '$2' ++ '$3').
  
  no_parens_expr -> dot_punctuated_identifier call_args_no_parens_strict : build_identifier('$1', '$2').
  no_parens_expr -> dot_op_identifier call_args_no_parens_strict : build_identifier('$1', '$2').
  no_parens_expr -> dot_identifier call_args_no_parens_strict : build_identifier('$1', '$2').
  no_parens_expr -> identifier_expr : '$1'.
  
  identifier_expr -> dot_punctuated_identifier : build_identifier('$1', []).
  identifier_expr -> dot_do_identifier : build_identifier('$1', nil).
  identifier_expr -> var : build_identifier('$1', nil).
  identifier_expr -> max_expr : '$1'.
  
  max_expr -> fn_eol stab end_eol : build_fn('$1', build_stab(lists:reverse('$2'))).
  max_expr -> open_paren stab close_paren : build_stab(lists:reverse('$2')).
  max_expr -> bracket_expr : '$1'.
  max_expr -> parens_call call_args_parens : build_identifier('$1', '$2').
  max_expr -> parens_call call_args_parens call_args_parens : build_nested_parens('$1', '$2', '$3').
  max_expr -> dot_alias : '$1'.
  max_expr -> base_expr : '$1'.
  
  bracket_expr -> dot_bracket_identifier bracket_access : build_access(build_identifier('$1', nil), '$2').
  bracket_expr -> max_expr bracket_access : build_access('$1', '$2').
  