int leaf_ambiguity_warning(int rid, int currentCkout){
  char *zBr;
  Stmt q;
  int n = 0;
  Blob msg;
  const char *zMainBranch;
  if( leaf_ambiguity(rid)==0 ) return 0;
  zMainBranch = db_get("main-branch", 0);
  zBr = db_text(0, "SELECT value FROM tagxref WHERE tagid=%d AND rid=%d",
                TAG_BRANCH, rid);
  if( zBr==0 ) zBr = fossil_strdup(zMainBranch);
  blob_init(&msg, 0, 0);
  blob_appendf(&msg, "WARNING: multiple open leaf check-ins on %s:", zBr);
  db_prepare(&q,
    "SELECT"