Macro assert_abi 

macro_rules! assert_abi {
    ($module:path $(,)?) => { ... };
    ($module:path, $snapshot_dir:expr $(,)?) => { ... };
}

Assert that a generated xabi module layout matches its committed snapshot.

The first argument is a module annotated with #[xabi::module]. The optional second argument overrides the snapshot directory, which defaults to xabi/snapshots.

xabi_assert::assert_abi!(exports, "xabi/snapshots");