foo.cc: In function 'int main()':
foo.cc:7:10: warning: left operand of comma operator has no effect [-Wunused-value]
    7 | for(;xmin<=xmax,xmin++)
      |      ~~~~^~~~~~
foo.cc:7:23: error: expected ';' before ')' token
    7 | for(;xmin<=xmax,xmin++)
      |                       ^
      |                       ;

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