code: def parse_interpolations(self, string):
          
          # Shortcut: if there are no #s in the string in the first place, it
          # must not have any interpolations, right?
          if '#' not in string:
              return Literal(String.unquoted(string))
          return self.parse_expression(string, 'goal_interpolated_literal')
docs: Parse a string for interpolations, but don't treat anything else as
          Sass syntax.  Returns an AST node.