error[E0658]: `?Trait` is not permitted in trait object types
  --> $DIR/trait-object-trait-parens.rs:8:24
   |
LL |     let _: Box<(Obj) + (?Sized) + (for<'a> Trait<'a>)>;
   |                        ^^^^^^^^
   |
   = help: add `#![feature(more_maybe_bounds)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error[E0658]: `?Trait` is not permitted in trait object types
  --> $DIR/trait-object-trait-parens.rs:13:16
   |
LL |     let _: Box<?Sized + (for<'a> Trait<'a>) + (Obj)>;
   |                ^^^^^^
   |
   = help: add `#![feature(more_maybe_bounds)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error[E0658]: `?Trait` is not permitted in trait object types
  --> $DIR/trait-object-trait-parens.rs:18:44
   |
LL |     let _: Box<for<'a> Trait<'a> + (Obj) + (?Sized)>;
   |                                            ^^^^^^^^
   |
   = help: add `#![feature(more_maybe_bounds)]` 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   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date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/trait-object-trait-parens.rs:8:16
   |
LL |     let _: Box<(Obj) + (?Sized) + (for<'a> Trait<'a>)>;
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = 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 a dyn-compatible trait, use `dyn`
   |
LL |     let _: Box<dyn (Obj) + (?Sized) + (for<'a> Trait<'a>)>;
   |                +++

error[E0225]: only auto traits can be used as additional traits in a trait object
  --> $DIR/trait-object-trait-parens.rs:8:35
   |
LL |     let _: Box<(Obj) + (?Sized) + (for<'a> Trait<'a>)>;
   |                -----              ^^^^^^^^^^^^^^^^^^^ additional non-auto trait
   |                |
   |                first non-auto trait
   |
   = help: consider creating a new trait with all of these as supertraits and using that trait here instead: `trait NewTrait: Obj + for<'a> Trait<'a> {}`
   = note: auto-traits like `Send` and `Sync` are traits that have special properties; for more information on them, visit <https://doc.rust-lang.org/reference/special-types-and-traits.html#auto-traits>

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/trait-object-trait-parens.rs:13:16
   |
LL |     let _: Box<?Sized + (for<'a> Trait<'a>) + (Obj)>;
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = 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>
help: if this is a dyn-compatible trait, use `dyn`
   |
LL |     let _: Box<dyn ?Sized + (for<'a> Trait<'a>) + (Obj)>;
   |                +++

error[E0225]: only auto traits can be used as additional traits in a trait object
  --> $DIR/trait-object-trait-parens.rs:13:47
   |
LL |     let _: Box<?Sized + (for<'a> Trait<'a>) + (Obj)>;
   |                         -------------------   ^^^^^ additional non-auto trait
   |                         |
   |                         first non-auto trait
   |
   = help: consider creating a new trait with all of these as supertraits and using that trait here instead: `trait NewTrait: for<'a> Trait<'a> + Obj {}`
   = note: auto-traits like `Send` and `Sync` are traits that have special properties; for more information on them, visit <https://doc.rust-lang.org/reference/special-types-and-traits.html#auto-traits>

warning: trait objects without an explicit `dyn` are deprecated
  --> $DIR/trait-object-trait-parens.rs:18:16
   |
LL |     let _: Box<for<'a> Trait<'a> + (Obj) + (?Sized)>;
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = 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>
help: if this is a dyn-compatible trait, use `dyn`
   |
LL |     let _: Box<dyn for<'a> Trait<'a> + (Obj) + (?Sized)>;
   |                +++

error[E0225]: only auto traits can be used as additional traits in a trait object
  --> $DIR/trait-object-trait-parens.rs:18:36
   |
LL |     let _: Box<for<'a> Trait<'a> + (Obj) + (?Sized)>;
   |                -----------------   ^^^^^ additional non-auto trait
   |                |
   |                first non-auto trait
   |
   = help: consider creating a new trait with all of these as supertraits and using that trait here instead: `trait NewTrait: for<'a> Trait<'a> + Obj {}`
   = note: auto-traits like `Send` and `Sync` are traits that have special properties; for more information on them, visit <https://doc.rust-lang.org/reference/special-types-and-traits.html#auto-traits>

error: aborting due to 6 previous errors; 3 warnings emitted

Some errors have detailed explanations: E0225, E0658.
For more information about an error, try `rustc --explain E0225`.