--- thunderbird-91.11.0/xpcom/idl-parser/xpidl/xpidl.py.python-inline-flags	2022-06-28 04:39:56.000000000 +0200
+++ thunderbird-91.11.0/xpcom/idl-parser/xpidl/xpidl.py	2022-07-11 21:55:05.287553042 +0200
@@ -1563,13 +1563,13 @@ class IDLParser(object):
     t_ignore = " \t"
 
     def t_multilinecomment(self, t):
-        r"/\*(?s).*?\*/"
+        r"/\*(?s:.*?)\*/"
         t.lexer.lineno += t.value.count("\n")
         if t.value.startswith("/**"):
             self._doccomments.append(t.value)
 
     def t_singlelinecomment(self, t):
-        r"(?m)//.*?$"
+        r"(?m://.*?$)"
 
     def t_IID(self, t):
         return t
@@ -1582,7 +1582,7 @@ class IDLParser(object):
         return t
 
     def t_LCDATA(self, t):
-        r"(?s)%\{[ ]*C\+\+[ ]*\n(?P<cdata>.*?\n?)%\}[ ]*(C\+\+)?"
+        r"(?s:%\{[ ]*C\+\+[ ]*\n(?P<cdata>.*?\n?)%\}[ ]*(C\+\+)?)"
         t.type = "CDATA"
         t.value = t.lexer.lexmatch.group("cdata")
         t.lexer.lineno += t.value.count("\n")