fix bugs

Author: methane

Lib/tokenize.py

@@ -87,7 +87,7 @@ def _all_string_prefixes():
     #  and don't contain any permutations (include 'fr', but not
     #  'rf'). The various permutations will be generated.
     _valid_string_prefixes = ['b', 'r', 'u', 'f', 't', 'd', 'br', 'fr', 'tr',
-                              'df', 'dt', 'dr', 'dfr', 'dtr']
+                              'bd', 'rd', 'fd', 'td', 'brd', 'frd', 'trd']
     # if we add binary f-strings, add: ['fb', 'fbr']
     result = {''}
     for prefix in _valid_string_prefixes:

Parser/string_parser.c

@@ -347,7 +347,7 @@ _PyPegen_parse_string(Parser *p, Token *t)
     int dedentmode = 0;
 
     if (Py_ISALPHA(quote)) {
-        while (!bytesmode || !rawmode) {
+        while (!bytesmode || !rawmode || !dedentmode) {
             if (quote == 'b' || quote == 'B') {
                 quote =(unsigned char)*++s;
                 bytesmode = 1;