void psi_let_stmt_dump(int fd, struct psi_let_stmt *stmt);
void *psi_let_stmt_exec(struct psi_let_stmt *stmt, struct psi_call_frame *frame);
void psi_let_stmt_dump(int fd, struct psi_let_stmt *stmt);
void *psi_let_stmt_exec(struct psi_let_stmt *stmt, struct psi_call_frame *frame);