{"ast_node_type":"function","tokens":[{"end":87,"kind":"keyword","start":0,"text":"pub"}]}
    pub fn impl_block_of_trait(self, trait_def_id: DefId) -> Option<&'hir Impl<'hir>> {
    /// Get a `hir::Impl` if the node is an impl block for the given `trait_def_id`.
        if let Node::Item(Item { kind: ItemKind::Impl(impl_block), .. }) = self