error: missing angle brackets in associated item path
  --> $DIR/bad-assoc-ty.rs:1:10
   |
LL | type A = [u8; 4]::AssocTy;
   |          ^^^^^^^
   |
help: types that don't start with an identifier need to be surrounded with angle brackets in qualified paths
   |
LL | type A = <[u8; 4]>::AssocTy;
   |          +       +

error: missing angle brackets in associated item path
  --> $DIR/bad-assoc-ty.rs:5:10
   |
LL | type B = [u8]::AssocTy;
   |          ^^^^
   |
help: types that don't start with an identifier need to be surrounded with angle brackets in qualified paths
   |
LL | type B = <[u8]>::AssocTy;
   |          +    +

error: missing angle brackets in associated item path
  --> $DIR/bad-assoc-ty.rs:9:10
   |
LL | type C = (u8)::AssocTy;
   |          ^^^^
   |
help: types that don't start with an identifier need to be surrounded with angle brackets in qualified paths
   |
LL | type C = <(u8)>::AssocTy;
   |          +    +

error: missing angle brackets in associated item path
  --> $DIR/bad-assoc-ty.rs:13:10
   |
LL | type D = (u8, u8)::AssocTy;
   |          ^^^^^^^^
   |
help: types that don't start with an identifier need to be surrounded with angle brackets in qualified paths
   |
LL | type D = <(u8, u8)>::AssocTy;
   |          +        +

error: missing angle brackets in associated item path
  --> $DIR/bad-assoc-ty.rs:17:10
   |
LL | type E = _::AssocTy;
   |          ^
   |
help: types that don't start with an identifier need to be surrounded with angle brackets in qualified paths
   |
LL | type E = <_>::AssocTy;
   |          + +

error: missing angle brackets in associated item path
  --> $DIR/bad-assoc-ty.rs:21:19
   |
LL | type F = &'static (u8)::AssocTy;
   |                   ^^^^
   |
help: types that don't start with an identifier need to be surrounded with angle brackets in qualified paths
   |
LL | type F = &'static <(u8)>::AssocTy;
   |                   +    +

error: missing angle brackets in associated item path
  --> $DIR/bad-assoc-ty.rs:27:10
   |
LL | type G = dyn 'static + (Send)::AssocTy;
   |          ^^^^^^^^^^^^^^^^^^^^
   |
help: types that don't start with an identifier need to be surrounded with angle brackets in qualified paths
   |
LL | type G = <dyn 'static + (Send)>::AssocTy;
   |          +                    +

error: missing angle brackets in associated item path
  --> $DIR/bad-assoc-ty.rs:46:10
   |
LL | type I = ty!()::AssocTy;
   |          ^^^^^
   |
help: types that don't start with an identifier need to be surrounded with angle brackets in qualified paths
   |
LL | type I = <ty!()>::AssocTy;
   |          +     +

error: missing angle brackets in associated item path
  --> $DIR/bad-assoc-ty.rs:39:19
   |
LL |     ($ty: ty) => ($ty::AssocTy);
   |                   ^^^
...
LL | type J = ty!(u8);
   |          ------- in this macro invocation
   |
   = note: this error originates in the macro `ty` (in Nightly builds, run with -Z macro-backtrace for more info)
help: types that don't start with an identifier need to be surrounded with angle brackets in qualified paths
   |
LL |     ($ty: ty) => (<$ty>::AssocTy);
   |                   +   +

error[E0223]: ambiguous associated type
  --> $DIR/bad-assoc-ty.rs:1:10
   |
LL | type A = [u8; 4]::AssocTy;
   |          ^^^^^^^^^^^^^^^^
   |
help: if there were a trait named `Example` with associated type `AssocTy` implemented for `[u8; 4]`, you could use the fully-qualified path
   |
LL | type A = <[u8; 4] as Example>::AssocTy;
   |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

error[E0223]: ambiguous associated type
  --> $DIR/bad-assoc-ty.rs:5:10
   |
LL | type B = [u8]::AssocTy;
   |          ^^^^^^^^^^^^^
   |
help: if there were a trait named `Example` with associated type `AssocTy` implemented for `[u8]`, you could use the fully-qualified path
   |
LL | type B = <[u8] as Example>::AssocTy;
   |          ~~~~~~~~~~~~~~~~~~~~~~~~~~

error[E0223]: ambiguous associated type
  --> $DIR/bad-assoc-ty.rs:9:10
   |
LL | type C = (u8)::AssocTy;
   |          ^^^^^^^^^^^^^
   |
help: if there were a trait named `Example` with associated type `AssocTy` implemented for `u8`, you could use the fully-qualified path
   |
LL | type C = <u8 as Example>::AssocTy;
   |          ~~~~~~~~~~~~~~~~~~~~~~~~

error[E0223]: ambiguous associated type
  --> $DIR/bad-assoc-ty.rs:13:10
   |
LL | type D = (u8, u8)::AssocTy;
   |          ^^^^^^^^^^^^^^^^^
   |
help: if there were a trait named `Example` with associated type `AssocTy` implemented for `(u8, u8)`, you could use the fully-qualified path
   |
LL | type D = <(u8, u8) as Example>::AssocTy;
   |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

error[E0121]: the placeholder `_` is not allowed within types on item signatures for type aliases
  --> $DIR/bad-assoc-ty.rs:17:10
   |
LL | type E = _::AssocTy;
   |          ^ not allowed in type signatures

error[E0223]: ambiguous associated type
  --> $DIR/bad-assoc-ty.rs:21:19
   |
LL | type F = &'static (u8)::AssocTy;
   |                   ^^^^^^^^^^^^^
   |
help: if there were a trait named `Example` with associated type `AssocTy` implemented for `u8`, you could use the fully-qualified path
   |
LL | type F = &'static <u8 as Example>::AssocTy;
   |                   ~~~~~~~~~~~~~~~~~~~~~~~~

error[E0223]: ambiguous associated type
  --> $DIR/bad-assoc-ty.rs:27:10
   |
LL | type G = dyn 'static + (Send)::AssocTy;
   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: if there were a trait named `Example` with associated type `AssocTy` implemented for `(dyn Send + 'static)`, you could use the fully-qualified path
   |
LL | type G = <(dyn Send + 'static) as Example>::AssocTy;
   |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/bad-assoc-ty.rs:33:10
   |
LL | type H = Fn(u8) -> (u8)::Output;
   |          ^^^^^^^^^^^^^^
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
   = note: `#[warn(bare_trait_objects)]` on by default
help: if this is an object-safe trait, use `dyn`
   |
LL | type H = <dyn Fn(u8) -> (u8)>::Output;
   |          ++++               +

error[E0223]: ambiguous associated type
  --> $DIR/bad-assoc-ty.rs:33:10
   |
LL | type H = Fn(u8) -> (u8)::Output;
   |          ^^^^^^^^^^^^^^^^^^^^^^ help: use fully-qualified syntax: `<(dyn Fn(u8) -> u8 + 'static) as IntoFuture>::Output`

error[E0223]: ambiguous associated type
  --> $DIR/bad-assoc-ty.rs:39:19
   |
LL |     ($ty: ty) => ($ty::AssocTy);
   |                   ^^^^^^^^^^^^
...
LL | type J = ty!(u8);
   |          ------- in this macro invocation
   |
   = note: this error originates in the macro `ty` (in Nightly builds, run with -Z macro-backtrace for more info)
help: if there were a trait named `Example` with associated type `AssocTy` implemented for `u8`, you could use the fully-qualified path
   |
LL |     ($ty: ty) => (<u8 as Example>::AssocTy);
   |                   ~~~~~~~~~~~~~~~~~~~~~~~~

error[E0223]: ambiguous associated type
  --> $DIR/bad-assoc-ty.rs:46:10
   |
LL | type I = ty!()::AssocTy;
   |          ^^^^^^^^^^^^^^
   |
help: if there were a trait named `Example` with associated type `AssocTy` implemented for `u8`, you could use the fully-qualified path
   |
LL | type I = <u8 as Example>::AssocTy;
   |          ~~~~~~~~~~~~~~~~~~~~~~~~

error[E0121]: the placeholder `_` is not allowed within types on item signatures for functions
  --> $DIR/bad-assoc-ty.rs:51:13
   |
LL | fn foo<X: K<_, _>>(x: X) {}
   |             ^  ^ not allowed in type signatures
   |             |
   |             not allowed in type signatures
   |
help: use type parameters instead
   |
LL | fn foo<X: K<T, T>, T>(x: X) {}
   |             ~  ~ +++

error[E0121]: the placeholder `_` is not allowed within types on item signatures for functions
  --> $DIR/bad-assoc-ty.rs:54:34
   |
LL | fn bar<F>(_: F) where F: Fn() -> _ {}
   |                                  ^ not allowed in type signatures
   |
help: use type parameters instead
   |
LL | fn bar<F, T>(_: F) where F: Fn() -> T {}
   |         +++                         ~

error[E0121]: the placeholder `_` is not allowed within types on item signatures for functions
  --> $DIR/bad-assoc-ty.rs:57:19
   |
LL | fn baz<F: Fn() -> _>(_: F) {}
   |                   ^ not allowed in type signatures
   |
help: use type parameters instead
   |
LL | fn baz<F: Fn() -> T, T>(_: F) {}
   |                   ~+++

error[E0121]: the placeholder `_` is not allowed within types on item signatures for structs
  --> $DIR/bad-assoc-ty.rs:60:33
   |
LL | struct L<F>(F) where F: Fn() -> _;
   |                                 ^ not allowed in type signatures
   |
help: use type parameters instead
   |
LL | struct L<F, T>(F) where F: Fn() -> T;
   |           +++                      ~

error[E0121]: the placeholder `_` is not allowed within types on item signatures for structs
  --> $DIR/bad-assoc-ty.rs:62:30
   |
LL | struct M<F> where F: Fn() -> _ {
   |                              ^ not allowed in type signatures
   |
help: use type parameters instead
   |
LL | struct M<F, T> where F: Fn() -> T {
   |           +++                   ~

error[E0121]: the placeholder `_` is not allowed within types on item signatures for enums
  --> $DIR/bad-assoc-ty.rs:66:28
   |
LL | enum N<F> where F: Fn() -> _ {
   |                            ^ not allowed in type signatures
   |
help: use type parameters instead
   |
LL | enum N<F, T> where F: Fn() -> T {
   |         +++                   ~

error[E0121]: the placeholder `_` is not allowed within types on item signatures for unions
  --> $DIR/bad-assoc-ty.rs:71:29
   |
LL | union O<F> where F: Fn() -> _ {
   |                             ^ not allowed in type signatures
   |
help: use type parameters instead
   |
LL | union O<F, T> where F: Fn() -> T {
   |          +++                   ~

error[E0121]: the placeholder `_` is not allowed within types on item signatures for traits
  --> $DIR/bad-assoc-ty.rs:77:29
   |
LL | trait P<F> where F: Fn() -> _ {
   |                             ^ not allowed in type signatures
   |
help: use type parameters instead
   |
LL | trait P<F, T> where F: Fn() -> T {
   |          +++                   ~

error[E0121]: the placeholder `_` is not allowed within types on item signatures for functions
  --> $DIR/bad-assoc-ty.rs:82:38
   |
LL |     fn foo<F>(_: F) where F: Fn() -> _ {}
   |                                      ^ not allowed in type signatures
   |
help: use type parameters instead
   |
LL |     fn foo<F, T>(_: F) where F: Fn() -> T {}
   |             +++                         ~

error[E0740]: field must implement `Copy` or be wrapped in `ManuallyDrop<...>` to be used in a union
  --> $DIR/bad-assoc-ty.rs:73:5
   |
LL |     foo: F,
   |     ^^^^^^
   |
   = note: union fields must not have drop side-effects, which is currently enforced via either `Copy` or `ManuallyDrop<...>`
help: wrap the field type in `ManuallyDrop<...>`
   |
LL |     foo: std::mem::ManuallyDrop<F>,
   |          +++++++++++++++++++++++ +

error: aborting due to 29 previous errors; 1 warning emitted

Some errors have detailed explanations: E0121, E0223, E0740.
For more information about an error, try `rustc --explain E0121`.