syntax_data: {"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let infcx = &tcx.infer_ctxt().build(TypingMode::non_body_analysis());
context_before: fn has_structural_eq_impl<'tcx>(tcx: TyCtxt<'tcx>, adt_ty: Ty<'tcx>) -> bool {
context_after:     let cause = ObligationCause::dummy();