// e.g. cast req to Req; 
// (converts req to (Req) req for the rest of the block)
svoid tok_castToStatements(LS tok) {
  while ((i = jfind(tok, "cast <id> to")) >= 0) {
    S id = tok.get(i+2);
    int iTypeStart = i+6;
    int semicolon = findEndOfStatement(tok, iTypeStart)-1;
    int endOfOuterBlock = findEndOfBracketPart(tok, semicolon)-1;
    S type = joinSubList(tok, iTypeStart, semicolon-1);
    
    for (int j = semicolon+2; j < endOfOuterBlock; j += 2)
      if (eqGet(tok, j, id))
        tok.set(j, "((" + type + ") " + id + ")");
        
    clearTokens(tok, i, semicolon+1);
    reTok(tok, i, endOfOuterBlock);
  }
}