/in/foo.cc:8:10: error: 'node' was not declared in this scope
 bool cmp(node a,node b)
          ^~~~
/in/foo.cc:8:17: error: 'node' was not declared in this scope
 bool cmp(node a,node b)
                 ^~~~
/in/foo.cc:8:23: error: expression list treated as compound expression in initializer [-fpermissive]
 bool cmp(node a,node b)
                       ^