error: expected type, found `{`
  --> $DIR/macro-fail-const.rs:16:27
   |
LL | fn make_marker() -> impl Marker<gimme_a_const!(marker)> {
   |                                 ----------------------
   |                                 |
   |                                 this macro call doesn't expand to a type
   |                                 in this macro invocation
...
LL |       ($rusty: ident) => {{ let $rusty = 3; *&$rusty }}
   |                           ^ expected type
   |
   = note: this error originates in the macro `gimme_a_const` (in Nightly builds, run with -Z macro-backtrace for more info)

error: expected type, found `{`
  --> $DIR/macro-fail-const.rs:16:27
   |
LL |   Example::<gimme_a_const!(marker)>
   |             ----------------------
   |             |
   |             this macro call doesn't expand to a type
   |             in this macro invocation
...
LL |       ($rusty: ident) => {{ let $rusty = 3; *&$rusty }}
   |                           ^ expected type
   |
   = note: this error originates in the macro `gimme_a_const` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0747]: type provided when a constant was expected
  --> $DIR/macro-fail-const.rs:5:33
   |
LL | fn make_marker() -> impl Marker<gimme_a_const!(marker)> {
   |                                 ^^^^^^^^^^^^^^^^^^^^^^

error[E0747]: type provided when a constant was expected
  --> $DIR/macro-fail-const.rs:5:33
   |
LL | fn make_marker() -> impl Marker<gimme_a_const!(marker)> {
   |                                 ^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error[E0747]: type provided when a constant was expected
  --> $DIR/macro-fail-const.rs:8:13
   |
LL |   Example::<gimme_a_const!(marker)>
   |             ^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 5 previous errors

For more information about this error, try `rustc --explain E0747`.