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Allow impl Fn() -> impl Trait in return position #93582

Merged
merged 7 commits into from
Oct 30, 2022
Merged

Allow impl Fn() -> impl Trait in return position #93582

merged 7 commits into from
Oct 30, 2022

Commits on Oct 25, 2022

  1. Allow impl Fn() -> impl Trait in return position 

    This allows writing the following function signatures:
```rust
fn f0() -> impl Fn() -> impl Trait;
fn f3() -> &'static dyn Fn() -> impl Trait;
```

These signatures were already allowed for common traits and associated
types, there is no reason why `Fn*` traits should be special in this
regard.
    @WaffleLapkin
    WaffleLapkin committed Oct 25, 2022
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  2. Add more tests for impl Fn() -> impl Trait

    @WaffleLapkin
    WaffleLapkin committed Oct 25, 2022
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  3. Add even more tests for impl Fn() -> impl Trait

    @WaffleLapkin
    WaffleLapkin committed Oct 25, 2022
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  4. Feature gate impl_trait_in_fn_trait_return

    @WaffleLapkin
    WaffleLapkin committed Oct 25, 2022
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  5. --bless

    @WaffleLapkin
    WaffleLapkin committed Oct 25, 2022
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  6. add a test for gate impl_trait_in_fn_trait_return

    @WaffleLapkin
    WaffleLapkin committed Oct 25, 2022
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  7. adopt to compiler changes

    @WaffleLapkin
    WaffleLapkin committed Oct 25, 2022
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