foo.cc: In function 'std::ostream& operator<<(std::ostream&, Matrix&)':
foo.cc:86:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   86 |   {for(int i=0;i<3;i++)
      |    ^~~
foo.cc:91:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   91 |    out<<endl;
      |    ^~~

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