{"ast_node_type":"variable","tokens":[{"end":43,"kind":"keyword","start":0,"text":"let"}]}
        let ty_span = ty.map(|ty| ty.span);
        let ty: Option<&hir::Ty<'_>> = inputs_hir.and_then(|h| h.get(idx));
        fcx.check_pat_top(param.pat, param_ty, ty_span, None, None);