// unimplemented S bla(); => S bla() { throw unimplemented(); }
svoid tok_unimplementedMethods(LS tok) {
  int i = -1;
  while ((i = jfind(tok, i+1, "unimplemented")) >= 0) {
    S t = get(tok, i+2);
    continue unless isIdentifier(t) || eq(t, "<");
    int j = tok_findEndOfMethodHeader(tok, i)+1;
    replaceTokens(tok, i, i+2, "");
    tokReplace(tok, j-1, " { throw unimplemented(); }");
    reTok(tok, i, j);
  }
}