syntax_data: {"ast_node_type":"variable","tokens":[{"end":74,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let context_args = tcx.mk_args(&[tcx.lifetimes.re_erased.into()]);
context_before:         let context_adt_ref = tcx.adt_def(context_did);
context_after:         let context_ty = Ty::new_adt(tcx, context_adt_ref, context_args);