void *psi_let_func_exec(struct psi_let_exp *func_val, struct psi_let_func *func, struct psi_decl_arg *darg, struct psi_call_frame *frame);
bool psi_let_func_validate(struct psi_data *data, struct psi_let_func *func, struct psi_validate_scope *scope);
void *psi_let_func_exec(struct psi_let_exp *func_val, struct psi_let_func *func, struct psi_decl_arg *darg, struct psi_call_frame *frame);
bool psi_let_func_validate(struct psi_data *data, struct psi_let_func *func, struct psi_validate_scope *scope);