/in/foo.cc: In function 'int main()':
/in/foo.cc:11:15: warning: left operand of comma operator has no effect [-Wunused-value]
   11 |         if (b == 1, 3, 5, 7, 8, 10, 12)
      |             ~~^~~~
/in/foo.cc:11:24: warning: right operand of comma operator has no effect [-Wunused-value]
   11 |         if (b == 1, 3, 5, 7, 8, 10, 12)
      |                        ^
/in/foo.cc:11:27: warning: right operand of comma operator has no effect [-Wunused-value]
   11 |         if (b == 1, 3, 5, 7, 8, 10, 12)
      |                           ^
/in/foo.cc:11:30: warning: right operand of comma operator has no effect [-Wunused-value]
   11 |         if (b == 1, 3, 5, 7, 8, 10, 12)
      |                              ^
/in/foo.cc:11:33: warning: right operand of comma operator has no effect [-Wunused-value]
   11 |         if (b == 1, 3, 5, 7, 8, 10, 12)
      |                                 ^~
/in/foo.cc:11:37: warning: right operand of comma operator has no effect [-Wunused-value]
   11 |         if (b == 1, 3, 5, 7, 8, 10, 12)
      |                                     ^~