foo.cc: In function 'std::ostream& operator<<(std::ostream&, Matrix3&)':
foo.cc:59:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   59 |   for(int i=0; i<3; i++)
      |   ^~~
foo.cc:62:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   62 |    out<<endl;
      |    ^~~

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