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error[E0391]: cycle detected when computing type of `Foo::T`
--> $DIR/issue-34373.rs:7:34
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LL | pub struct Foo<T = Box<dyn Trait<DefaultFoo>>>;
| ^^^^^^^^^^
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note: ...which requires expanding type alias `DefaultFoo`...
--> $DIR/issue-34373.rs:9:19
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LL | type DefaultFoo = Foo;
| ^^^
= note: ...which again requires computing type of `Foo::T`, completing the cycle
note: cycle used when checking that `Foo` is well-formed
--> $DIR/issue-34373.rs:7:1
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LL | pub struct Foo<T = Box<dyn Trait<DefaultFoo>>>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
error[E0392]: type parameter `T` is never used
--> $DIR/issue-34373.rs:7:16
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LL | pub struct Foo<T = Box<dyn Trait<DefaultFoo>>>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unused type parameter
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= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
= help: if you intended `T` to be a const parameter, use `const T: /* Type */` instead
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0391, E0392.
For more information about an error, try `rustc --explain E0391`.
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