foo.cc: In function ‘int main()’:
foo.cc:6:14: error: expected ‘;’ before ‘==’ token
    6 |     for(int i==m;i<=n;i++)
      |              ^~
      |              ;
foo.cc:6:14: error: expected primary-expression before ‘==’ token
    6 |     for(int i==m;i<=n;i++)
      |              ^~
foo.cc:6:22: error: expected ‘)’ before ‘;’ token
    6 |     for(int i==m;i<=n;i++)
      |        ~             ^
      |                      )
foo.cc:6:23: error: ‘i’ was not declared in this scope
    6 |     for(int i==m;i<=n;i++)
      |                       ^
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