syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":".chain(tcx.assumed_wf_types(impl_def_id).into_iter().copied()),"}]}
source_snippet:                             .chain(tcx.assumed_wf_types(impl_def_id).into_iter().copied()),
context_before:                             .iter_instantiated_copied(tcx, args)
context_after:                     )