Looks at line 'i' to see if the line matches a module user type def.

def _match_type(self, i):
        """Looks at line 'i' to see if the line matches a module user type def."""
        self.col_match = self.RE_TYPE.match(self._source[i])
        if self.col_match is not None:
            self.section = "types"
            self.el_type = CustomType
            self.el_name = self.col_match.group("name")
           
            return True
        else:
            return False