VALID_STRING_ESCAPE_TOKEN ('\u{1_0}')
VALID_STRING_ESCAPE_TOKEN ('\u{10_}')
VALID_STRING_ESCAPE_TOKEN ('\u{10_0000}')
VALID_STRING_ESCAPE_TOKEN ('\u{10___0000}')
INVALID_UNICODE_ESCAPE_TOKEN ('\u{_}')
INVALID_UNICODE_ESCAPE_TOKEN ('\u{_1}')
