anchor.diff:    call_exprs _call_exprs
     fun_call_expr _fun_call_expr
     method_call_expr _method_call_expr
  -  erlang_call_expr space_sharp_expr
  +  erlang_call_expr
     min_expr
   
     string_base
  
positive.code: dot_eol -> '.' eol : '$1'.
  
  % Sharp
  dot_sharp -> '#'     : '$1'.
  dot_sharp -> '#' eol : '$1'.
  unary_sharp -> '#'   : '$1'.
  space_sharp -> 's#'  : '$1'.
  
  sharp_identifier -> min_expr : '$1'.
  sharp_identifier -> base_identifier : '$1'.
  
negative.code:   and_op
    andand_op
    oror_op
    dot_eol sharp_eol unary_sharp sharp_identifier
    guards
    module_decl
    method_decl method_name method_body implicit_method_name method_ops_identifier implicit_method_ops_identifier
  