/in/foo.cc: In function 'int main()':
/in/foo.cc:90:26: error: 'Merge' was not declared in this scope
  Merge(seqlist1, seqlist2);
                          ^
/in/foo.cc:92:18: error: 'seqlist3' was not declared in this scope
  Merge(seqlist1, seqlist3);
                  ^~~~~~~~