fn diff_assoc_items(
db: &RootDatabase,
target_trait: Trait,
impl_items: Vec<AssocItem>,
impl_crate: Crate,
) -> Vec<(AssocItem, IsRequiredAssocItem)>fn diff_assoc_items(
db: &RootDatabase,
target_trait: Trait,
impl_items: Vec<AssocItem>,
impl_crate: Crate,
) -> Vec<(AssocItem, IsRequiredAssocItem)>