syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"trait_item_def_id:"}]}
source_snippet:         trait_item_def_id: impl_item.trait_item_def_id,
context_before:         def_id: owner_id.to_def_id(),
context_after:         container: ty::AssocItemContainer::Impl,