src/test/ui/issues/issue-86756.stderr

   1 error[E0403]: the name `T` is already used for a generic parameter in this item's generic parameters
   2   --> $DIR/issue-86756.rs:1:14
   3    |
   4 LL | trait Foo<T, T = T> {}
   5    |           -  ^ already used
   6    |           |
   7    |           first use of `T`
   8
   9 error[E0412]: cannot find type `dyn` in this scope
  10   --> $DIR/issue-86756.rs:5:10
  11    |
  12 LL | fn eq<A, B>() {
  13    |           - help: you might be missing a type parameter: `, dyn`
  14 LL |     eq::<dyn, Foo>
  15    |          ^^^ not found in this scope
  16
  17 warning: trait objects without an explicit `dyn` are deprecated
  18   --> $DIR/issue-86756.rs:5:15
  19    |
  20 LL |     eq::<dyn, Foo>
  21    |               ^^^
  22    |
  23    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
  24    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
  25    = note: `#[warn(bare_trait_objects)]` on by default
  26 help: use `dyn`
  27    |
  28 LL |     eq::<dyn, dyn Foo>
  29    |               +++
  30
  31 error[E0107]: missing generics for trait `Foo`
  32   --> $DIR/issue-86756.rs:5:15
  33    |
  34 LL |     eq::<dyn, Foo>
  35    |               ^^^ expected at least 1 generic argument
  36    |
  37 note: trait defined here, with at least 1 generic parameter: `T`
  38   --> $DIR/issue-86756.rs:1:7
  39    |
  40 LL | trait Foo<T, T = T> {}
  41    |       ^^^ -
  42 help: add missing generic argument
  43    |
  44 LL |     eq::<dyn, Foo<T>>
  45    |               ~~~~~~
  46
  47 error: aborting due to 3 previous errors; 1 warning emitted
  48
  49 Some errors have detailed explanations: E0107, E0403, E0412.
  50 For more information about an error, try `rustc --explain E0107`.