@staticmethod<EOL><INDENT>def __completion_matcher(text: str) -> CompletionMatcher:<DEDENT>
def is_match(entry: Tuple[sym.Symbol, Any]) -> bool:<EOL><INDENT>return entry[<NUM_LIT:0>].name.startswith(text)<EOL><DEDENT>return is_match<EOL>
Return a function which matches any symbol keys from map entries
        against the given text.