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internally change regions to be covariant
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1 error[E0277]: the trait bound `Self: Trait1` is not satisfied
2   --> $DIR/issue-74816.rs:8:31
3    |
4 LL |     type Associated: Trait1 = Self;
5    |                               ^^^^ the trait `Trait1` is not implemented for `Self`
6    |
7 note: required by a bound in `Trait2::Associated`
8   --> $DIR/issue-74816.rs:8:22
9    |
10 LL |     type Associated: Trait1 = Self;
11    |                      ^^^^^^ required by this bound in `Trait2::Associated`
12 help: consider further restricting `Self`
13    |
14 LL | trait Trait2: Trait1 {
15    |             ++++++++
16
17 error[E0277]: the size for values of type `Self` cannot be known at compilation time
18   --> $DIR/issue-74816.rs:8:31
19    |
20 LL |     type Associated: Trait1 = Self;
21    |                               ^^^^ doesn't have a size known at compile-time
22    |
23 note: required by a bound in `Trait2::Associated`
24   --> $DIR/issue-74816.rs:8:5
25    |
26 LL |     type Associated: Trait1 = Self;
27    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Trait2::Associated`
28 help: consider further restricting `Self`
29    |
30 LL | trait Trait2: Sized {
31    |             +++++++
32
33 error: aborting due to 2 previous errors
34
35 For more information about this error, try `rustc --explain E0277`.