foo.cc: In function 'int main()':
foo.cc:8:13: error: 'i' was not declared in this scope; did you mean 'i0'?
    8 |  for(int i0;i<n;i++)
      |             ^
      |             i0
foo.cc:8:10: warning: unused variable 'i0' [-Wunused-variable]
    8 |  for(int i0;i<n;i++)
      |          ^~

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