/in/foo.cc:83:2: error: expected '}' at end of input
   83 | }
      |  ^
/in/foo.cc:7:14: note: to match this '{'
    7 | class BigInt {
      |              ^
/in/foo.cc: In member function 'bool BigInt::operator<(const BigInt&) const':
/in/foo.cc:44:25: error: a function-definition is not allowed here before '{' token
   44 |     void Output() const {
      |                         ^
/in/foo.cc: In member function 'void BigInt::BigIntArray::Output()':
/in/foo.cc:66:17: error: 'const class BigInt' has no member named 'Output'
   66 |             num.Output();
      |                 ^~~~~~
/in/foo.cc: At global scope:
/in/foo.cc:83:2: error: expected unqualified-id at end of input
   83 | }
      |  ^