foo.cc: In function 'int main()':
foo.cc:12:13: warning: unused variable 'tmp' [-Wunused-variable]
   12 |         int tmp = 0;
      |             ^~~
foo.cc:17:13: warning: unused variable 'a3' [-Wunused-variable]
   17 |         int a3 = 0;
      |             ^~
foo.cc:18:13: warning: unused variable 'a4' [-Wunused-variable]
   18 |         int a4 = 0;
      |             ^~
foo.cc:19:13: warning: variable 'jsq2' set but not used [-Wunused-but-set-variable]
   19 |         int jsq2 = 0;
      |             ^~~~
foo.cc:25:13: warning: unused variable 'jsq3' [-Wunused-variable]
   25 |         int jsq3 = 0;
      |             ^~~~

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