syntax_data: {"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let assoc_items = tcx.associated_item_def_ids(
context_before:             ty::Param(_) | ty::Alias(..) | ty::Infer(ty::TyVar(_)) => {
context_after:                     tcx.require_lang_item(hir::LangItem::DiscriminantKind, DUMMY_SP),