public Expression paren_expression()
{
Expression expression = null;
try
{
this.match(0x3f);
expression = this.expression();
this.match(0x40);
}
catch (RecognitionException exception)
{
if (base.inputState.guessing != 0)
{
throw;
}
this.reportError(exception);
this.recover(exception, tokenSet_20_);
return expression;
}
return expression;
}