error: expected type, found `{`
  --> $DIR/macro-fail.rs:33:27
   |
LL | fn make_marker() -> impl Marker<gimme_a_const!(marker)> {
   |                                 ----------------------
   |                                 |
   |                                 this macro call doesn't expand to a type
   |                                 in this macro invocation
...
LL |       ($rusty: ident) => {{ let $rusty = 3; *&$rusty }}
   |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected type
   |
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: expected type, found `{`
  --> $DIR/macro-fail.rs:33:27
   |
LL |   Example::<gimme_a_const!(marker)>
   |             ----------------------
   |             |
   |             this macro call doesn't expand to a type
   |             in this macro invocation
...
LL |       ($rusty: ident) => {{ let $rusty = 3; *&$rusty }}
   |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected type
   |
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: expected type, found `{`
  --> $DIR/macro-fail.rs:6:10
   |
LL |     () => {{
   |  __________^
LL | |
LL | |     const X: usize = 1337;
LL | |     X
LL | |   }}
   | |___^ expected type
...
LL |     let _fail = Example::<external_macro!()>;
   |                           -----------------
   |                           |
   |                           this macro call doesn't expand to a type
   |                           in this macro invocation
   |
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: unexpected end of macro invocation
  --> $DIR/macro-fail.rs:44:25
   |
LL |     macro_rules! gimme_a_const {
   |     -------------------------- when calling this macro
...
LL |   let _fail = Example::<gimme_a_const!()>;
   |                         ^^^^^^^^^^^^^^^^ missing tokens in macro arguments

error[E0107]: wrong number of const arguments: expected 1, found 0
  --> $DIR/macro-fail.rs:16:26
   |
LL | fn make_marker() -> impl Marker<gimme_a_const!(marker)> {
   |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected 1 const argument

error[E0107]: wrong number of type arguments: expected 0, found 1
  --> $DIR/macro-fail.rs:16:33
   |
LL | fn make_marker() -> impl Marker<gimme_a_const!(marker)> {
   |                                 ^^^^^^^^^^^^^^^^^^^^^^ unexpected type argument

error[E0107]: wrong number of const arguments: expected 1, found 0
  --> $DIR/macro-fail.rs:19:3
   |
LL |   Example::<gimme_a_const!(marker)>
   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected 1 const argument

error[E0107]: wrong number of type arguments: expected 0, found 1
  --> $DIR/macro-fail.rs:19:13
   |
LL |   Example::<gimme_a_const!(marker)>
   |             ^^^^^^^^^^^^^^^^^^^^^^ unexpected type argument

error[E0107]: wrong number of const arguments: expected 1, found 0
  --> $DIR/macro-fail.rs:40:15
   |
LL |   let _fail = Example::<external_macro!()>;
   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected 1 const argument

error[E0107]: wrong number of type arguments: expected 0, found 1
  --> $DIR/macro-fail.rs:40:25
   |
LL |   let _fail = Example::<external_macro!()>;
   |                         ^^^^^^^^^^^^^^^^^ unexpected type argument

error[E0107]: wrong number of const arguments: expected 1, found 0
  --> $DIR/macro-fail.rs:44:15
   |
LL |   let _fail = Example::<gimme_a_const!()>;
   |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected 1 const argument

error[E0107]: wrong number of type arguments: expected 0, found 1
  --> $DIR/macro-fail.rs:44:25
   |
LL |   let _fail = Example::<gimme_a_const!()>;
   |                         ^^^^^^^^^^^^^^^^ unexpected type argument

error: aborting due to 12 previous errors

For more information about this error, try `rustc --explain E0107`.