syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"ty::Binder::dummy(AutoImplConstituents"}]}
source_snippet:                 ty::Binder::dummy(AutoImplConstituents {
context_before:                 );
context_after:                     types: [ty].into_iter().chain(iter::once(witness)).collect(),