{"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"if"}]}
        if let Node::Item(Item { kind: ItemKind::Impl(impl_block), .. }) = self
    pub fn impl_block_of_trait(self, trait_def_id: DefId) -> Option<&'hir Impl<'hir>> {
            && let Some(trait_ref) = impl_block.of_trait