foo.cc: In function 'int main()':
foo.cc:8:6: warning: variable 'A1' set but not used [-Wunused-but-set-variable]
    8 |  int A1=0,A2=0,A=0;
      |      ^~
foo.cc:8:11: warning: unused variable 'A2' [-Wunused-variable]
    8 |  int A1=0,A2=0,A=0;
      |           ^~
foo.cc:8:16: warning: variable 'A' set but not used [-Wunused-but-set-variable]
    8 |  int A1=0,A2=0,A=0;
      |                ^
foo.cc:9:6: warning: unused variable 'B1' [-Wunused-variable]
    9 |  int B1=0,B2=0,B=0;
      |      ^~
foo.cc:9:11: warning: unused variable 'B2' [-Wunused-variable]
    9 |  int B1=0,B2=0,B=0;
      |           ^~
foo.cc:9:16: warning: variable 'B' set but not used [-Wunused-but-set-variable]
    9 |  int B1=0,B2=0,B=0;
      |                ^
foo.cc:10:6: warning: variable 'C1' set but not used [-Wunused-but-set-variable]
   10 |  int C1=0,C2=0,C=0;
      |      ^~
foo.cc:10:11: warning: variable 'C2' set but not used [-Wunused-but-set-variable]
   10 |  int C1=0,C2=0,C=0;
      |           ^~
foo.cc:10:16: warning: unused variable 'C' [-Wunused-variable]
   10 |  int C1=0,C2=0,C=0;
      |                ^
foo.cc:11:6: warning: variable 'D1' set but not used [-Wunused-but-set-variable]
   11 |  int D1=0,D2=0,D=0;
      |      ^~
foo.cc:11:11: warning: variable 'D2' set but not used [-Wunused-but-set-variable]
   11 |  int D1=0,D2=0,D=0;
      |           ^~
foo.cc:11:16: warning: unused variable 'D' [-Wunused-variable]
   11 |  int D1=0,D2=0,D=0;
      |                ^

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