syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"Some(hir::Item"}]}
source_snippet:         Some(hir::Item { kind: hir::ItemKind::Impl(impl_), owner_id, .. }) => {
context_before:     let (items, impl_def_id) = match item {
context_after:             (impl_.items, *owner_id)