// -Syntax: switch to q();
// -rest of block is executed in Queue q()
svoid tok_switchTo(L<S> tok) {
  int i = -1;
  while ((i = jfind(tok, i+1, "switch to")) >= 0) {
    int semicolon = findEndOfStatement(tok, i)-1;
    int endOfOuterBlock = findEndOfBracketPart(tok, semicolon)-1;
    clearTokens(tok, i, i+4);
    tok.set(semicolon, ".add(r {");
    tok.set(endOfOuterBlock, "}); }");
    reTok(tok, i, endOfOuterBlock+1);
  }
}