/in/foo.cc: In function 'int s1(int)':
/in/foo.cc:9:6: warning: unused variable 's' [-Wunused-variable]
  int s;
      ^
/in/foo.cc: In function 'void s3(int, int)':
/in/foo.cc:38:4: error: expected ';' before 'unm'
    unm++;
    ^~~