continue;
int n1 = robust_scm2int (scm_car (candidate), -1);
int n2 = robust_scm2int (scm_cdr (candidate), -1);
- if (n1 < 0 || n2 < 0 || n1 >= note_heads.size ())
+ if ((n1 < 0) || (n2 < 0) || (size_t(n1) >= note_heads.size ()))
continue;
note_column_1.push_back (vsize (n1));
note_column_2.push_back (vsize (n2));