...
LL | let _fail = Example::<gimme_a_const!()>;
| ^^^^^^^^^^^^^^^^ missing tokens in macro arguments
+ |
+note: while trying to match meta-variable `$rusty:ident`
+ --> $DIR/macro-fail.rs:28:8
+ |
+LL | ($rusty: ident) => {{ let $rusty = 3; *&$rusty }}
+ | ^^^^^^^^^^^^^
error[E0747]: type provided when a constant was expected
--> $DIR/macro-fail.rs:14:33