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+error[E0403]: the name `T` is already used for a generic parameter in this item's generic parameters
+ --> $DIR/issue-86756.rs:1:14
+ |
+LL | trait Foo<T, T = T> {}
+ | - ^ already used
+ | |
+ | first use of `T`
+
+error[E0412]: cannot find type `dyn` in this scope
+ --> $DIR/issue-86756.rs:5:10
+ |
+LL | fn eq<A, B>() {
+ | - help: you might be missing a type parameter: `, dyn`
+LL | eq::<dyn, Foo>
+ | ^^^ not found in this scope
+
+warning: trait objects without an explicit `dyn` are deprecated
+ --> $DIR/issue-86756.rs:5:15
+ |
+LL | eq::<dyn, Foo>
+ | ^^^
+ |
+ = note: `#[warn(bare_trait_objects)]` on by default
+ = 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: use `dyn`
+ |
+LL - eq::<dyn, Foo>
+LL + eq::<dyn, dyn Foo>
+ |
+
+error[E0107]: missing generics for trait `Foo`
+ --> $DIR/issue-86756.rs:5:15
+ |
+LL | eq::<dyn, Foo>
+ | ^^^ expected at least 1 generic argument
+ |
+note: trait defined here, with at least 1 generic parameter: `T`
+ --> $DIR/issue-86756.rs:1:7
+ |
+LL | trait Foo<T, T = T> {}
+ | ^^^ -
+help: add missing generic argument
+ |
+LL | eq::<dyn, Foo<T>>
+ | ~~~~~~
+
+error: aborting due to 3 previous errors; 1 warning emitted
+
+Some errors have detailed explanations: E0107, E0403, E0412.
+For more information about an error, try `rustc --explain E0107`.