================================================================================
attribute with literal
================================================================================

foo = "bar"

--------------------------------------------------------------------------------

(config_file
  (body
    (attribute
      (identifier)
      (expression
        (literal_value
          (string_lit
            (quoted_template_start)
            (template_literal)
            (quoted_template_end)))))))

================================================================================
attribute with variable
================================================================================

foo = bar

--------------------------------------------------------------------------------

(config_file
  (body
    (attribute
      (identifier)
      (expression
        (variable_expr
          (identifier))))))