syntax_data: {"ast_node_type":"other","tokens":[{"end":9,"kind":"keyword","start":0,"text":"{"}]}
source_snippet:         {
context_before:             && let Some(impl_def_id) = assoc_item.item.container_id(tcx).as_local()
context_after:             tcx.ensure_ok().enforce_impl_non_lifetime_params_are_constrained(impl_def_id)?;