void *psi_let_exp_exec(struct psi_let_exp *exp, struct psi_decl_arg *darg, void *actual_location, size_t actual_size, struct psi_call_frame *frame);
bool psi_let_exp_validate(struct psi_data *data, struct psi_let_exp *exp, struct psi_validate_scope *scope);
void *psi_let_exp_exec(struct psi_let_exp *exp, struct psi_decl_arg *darg, void *actual_location, size_t actual_size, struct psi_call_frame *frame);
bool psi_let_exp_validate(struct psi_data *data, struct psi_let_exp *exp, struct psi_validate_scope *scope);