tests/ui/traits/const-traits/macro-const-trait-bound-theoretical-regression.stderr

error: macro expansion ignores keyword `dyn` and any tokens following
  --> $DIR/macro-const-trait-bound-theoretical-regression.rs:14:31
   |
LL |     (dyn $c:ident Trait) => { dyn $c Trait {} };
   |                               ^^^
...
LL | demo! { dyn const Trait }
   | ------------------------- caused by the macro expansion here
   |
   = note: the usage of `demo!` is likely invalid in item context

error: inherent impls cannot be `const`
  --> $DIR/macro-const-trait-bound-theoretical-regression.rs:10:40
   |
LL |     (impl $c:ident Trait) => { impl $c Trait {} };
   |                                        ^^^^^ inherent impl for this type
...
LL | demo! { impl const Trait }
   | --------------------------
   | |            |
   | |            `const` because of this
   | in this macro invocation
   |
   = note: only trait implementations may be annotated with `const`
   = note: this error originates in the macro `demo` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0658]: const trait impls are experimental
  --> $DIR/macro-const-trait-bound-theoretical-regression.rs:17:14
   |
LL | demo! { impl const Trait }
   |              ^^^^^
   |
   = note: see issue #143874 <https://github.com/rust-lang/rust/issues/143874> for more information
   = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/macro-const-trait-bound-theoretical-regression.rs:10:40
   |
LL |     (impl $c:ident Trait) => { impl $c Trait {} };
   |                                        ^^^^^
...
LL | demo! { impl const Trait }
   | -------------------------- in this macro invocation
   |
   = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
   = note: `#[warn(bare_trait_objects)]` on by default
   = note: this warning originates in the macro `demo` (in Nightly builds, run with -Z macro-backtrace for more info)
help: you might have intended to implement this trait for a given type
   |
LL |     (impl $c:ident Trait) => { impl $c Trait for /* Type */ {} };
   |                                              ++++++++++++++

error: aborting due to 3 previous errors; 1 warning emitted

For more information about this error, try `rustc --explain E0658`.