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cal {
  // while(true) {
  int x;
}

In [10]: parse("""cal {
    ...: // while(true) {
    ...: int x;
    ...: }
    ...: """)
---------------------------------------------------------------------------
ParseCancellationException                Traceback (most recent call last)
File ~/source/interpres/.venv/lib/python3.10/site-packages/openqasm3/parser.py:87, in parse(input_, permissive)
     86 try:
---> 87     tree = parser.program()
     88 except (RecognitionException, ParseCancellationException) as exc:

File ~/source/interpres/.venv/lib/python3.10/site-packages/openqasm3/_antlr/_4_11/qasm3Parser.py:640, in qasm3Parser.program(self)
    639 self.state = 131
--> 640 self.statement()
    641 self.state = 136

File ~/source/interpres/.venv/lib/python3.10/site-packages/openqasm3/_antlr/_4_11/qasm3Parser.py:919, in qasm3Parser.statement(self)
    918 self.state = 155
--> 919 self.calStatement()
    920 pass

File ~/source/interpres/.venv/lib/python3.10/site-packages/openqasm3/_antlr/_4_11/qasm3Parser.py:3352, in qasm3Parser.calStatement(self)
   3351     self.state = 423
-> 3352     self.match(qasm3Parser.RBRACE)
   3353 except RecognitionException as re:

File ~/source/interpres/.venv/lib/python3.10/site-packages/antlr4/Parser.py:126, in Parser.match(self, ttype)
    125 else:
--> 126     t = self._errHandler.recoverInline(self)
    127     if self.buildParseTrees and t.tokenIndex==-1:
    128         # we must have conjured up a new token during single token insertion
    129         # if it's not the current symbol

File ~/source/interpres/.venv/lib/python3.10/site-packages/antlr4/error/ErrorStrategy.py:703, in BailErrorStrategy.recoverInline(self, recognizer)
    702 def recoverInline(self, recognizer:Parser):
--> 703     self.recover(recognizer, InputMismatchException(recognizer))

File ~/source/interpres/.venv/lib/python3.10/site-packages/antlr4/error/ErrorStrategy.py:697, in BailErrorStrategy.recover(self, recognizer, e)
    696     context = context.parentCtx
--> 697 raise ParseCancellationException(e)

ParseCancellationException: None

while (true) {
  // while(true) {
  int x;
}