syntax_data: {"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let context_adt_ref = tcx.adt_def(context_did);
context_before:         let context_did = tcx.require_lang_item(LangItem::Context, DUMMY_SP);
context_after:         let context_args = tcx.mk_args(&[tcx.lifetimes.re_erased.into()]);