{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
        let ty = self.fcx.typeck_results.borrow().expr_ty_adjusted(expr);
    fn expr_ty(&self, expr: &hir::Expr<'tcx>) -> Ty<'tcx> {
        let ty = self.fcx.try_structurally_resolve_type(expr.span, ty);