foo.cc: In function 'int main()':
foo.cc:46:38: error: expected ';' before ')' token
   46 |                         case 'A':shun);break;
      |                                      ^
      |                                      ;
foo.cc:46:34: warning: statement is a reference, not call, to function 'shun' [-Waddress]
   46 |                         case 'A':shun);break;
      |                                  ^~~~
foo.cc:46:34: warning: statement has no effect [-Wunused-value]

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