syntax_data: {"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let partial_eq_trait_id = tcx.require_lang_item(hir::LangItem::PartialEq, DUMMY_SP);
context_before:     // using `PartialEq::eq` in this scenario in the past.)
context_after:     let structural_partial_eq_trait_id =