void progn_ex (MNode* arg, MlEnv* mlenv);
void checkDefun (MNode* cell, ustring& rname, MNode*& sexp);
MNode* newLambda (MNode* cell);
-bool isLambda (MNode* sexp);
MNode* buildArgs (int start, const std::vector<ustring>& args);
MNode* buildArgs (int start, const std::vector<ustring>& args, const ustring& arg2);
MNode* buildArgs (const ustring& arg1);