sS tok_dropRoundOrCurlyBrackets(S s) {
  ret join(tok_dropRoundOrCurlyBrackets(javaTok(s)));
}

static LS tok_dropRoundOrCurlyBrackets(LS tok) {
  for (int i = 1; i < l(tok); i+= 2) {
    while (eqGetOneOf(tok, i, "(", ")", "{", "}")) {
      tokAppend(tok, i-1, tok.get(i+1));
      removeSubList(tok, i, i+2);
    }
  }
  ret tok;
}

Began life as a copy of #1025589