syntax_data: {"ast_node_type":"variable","tokens":[{"end":40,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let structural_partial_eq_trait_id =
context_before:     let partial_eq_trait_id = tcx.require_lang_item(hir::LangItem::PartialEq, DUMMY_SP);
context_after:         tcx.require_lang_item(hir::LangItem::StructuralPeq, DUMMY_SP);