Macro assert_owner 

macro_rules! assert_owner {
    ($program_account: expr, $owner: expr $(,)?) => { ... };
    ($program_account: expr, $owner: ident $(,)?) => { ... };
    ($program_account: expr, $owner: ident, $msg: expr $(,)?) => { ... };
    ($program_account: expr, $owner: expr, $msg: expr $(,)?) => { ... };
}

👎Deprecated since 1.5.6: As of Anchor 0.15, Anchor handles this for you automatically.

Asserts that an account is owned by the given program.

As of Anchor 0.15, Anchor handles this for you automatically. You should not need to use this.