Macro const_pda 

macro_rules! const_pda {
    ( $program_id:expr, [ $( $seed:expr ),* $(,)? ], $bump:expr ) => { ... };
}

A program-derived address evaluated at compile time: const_pda!(PROGRAM_ID, [seed, ...], bump) is pda::const_program_address with the seed list spelled inline (each seed anything that casts to &[u8]: a byte-string literal, an Address::as_array(), a &[u8; N]). See that function for the bump contract and the soundness note.

hopper::declare_id!("F4Um7PWsnZfN7y8WFzu1aPYJwqGduJTa4zuCGY9EUqMy");
pub const VAULT: hopper::Address = hopper::const_pda!(ID, [b"vault", ID.as_array()], 255);