foo.cc: In function 'int fib1(int)':
foo.cc:9:36: error: 'fib2' was not declared in this scope; did you mean 'fib1'?
    9 |         return fib1(n-1)+fib1(n-2)+fib2(n-3);
      |                                    ^~~~
      |                                    fib1

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