svoid tok_doPing(LS tok) {
  jreplace(tok, "do ping {", "do { ping();");
  
  int i;
  while ((i = jfind(tok, "do ping <id>")) >= 0) {
    int j = tok_findEndOfStatement(tok, i+4);
    tok.set(i+2, "{ ping();");
    tokAppend(tok, j-1, " }");
    reTok(tok, i, j);
  }
}