syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"Ty::new_projection(tcx,"}]}
source_snippet:                     Ty::new_projection(tcx, metadata_def_id, [tail_ty])
context_before:                     let metadata_def_id = tcx.require_lang_item(LangItem::Metadata, DUMMY_SP);
context_after:                 }