foo.cc: In function 'int main()':
foo.cc:10:3: error: 'it' was not declared in this scope; did you mean 'i'?
   10 |   it=i;
      |   ^~
      |   i
foo.cc:12:7: error: expected ';' before 'while'
   12 |    f=1
      |       ^
      |       ;
   13 |   while(it)
      |   ~~~~~

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