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fix: handle closure return type adjustments in add_return_type #20816

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Merged
merged 1 commit into from
Oct 10, 2025
Merged

fix: handle closure return type adjustments in add_return_type #20816

merged 1 commit into from
Oct 10, 2025

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A4-Tacks
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@A4-Tacks A4-Tacks commented Oct 9, 2025

Example

fn foo() {
    let f = ||$0 {loop {}};
    let _: fn() -> i8 = f;
}

Before this PR:

fn foo() {
    let f = || -> ! {loop {}};
    let _: fn() -> i8 = f;
}

mismatched types error on line 3

After this PR:

fn foo() {
    let f = || -> i8 {loop {}};
    let _: fn() -> i8 = f;
}

@A4-Tacks
Fix closure coerced return type for add_return_type
a77747f 
Example
---
```rust
fn foo() {
    let f = ||$0 {loop {}};
    let _: fn() -> i8 = f;
}
```

**Before this PR**:

```rust
fn foo() {
    let f = || -> ! {loop {}};
    let _: fn() -> i8 = f;
}
```

mismatched types error on line 3

**After this PR**:

```rust
fn foo() {
    let f = || -> i8 {loop {}};
    let _: fn() -> i8 = f;
}
```
@rustbot rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 9, 2025
ShoyuVanilla
ShoyuVanilla approved these changes Oct 10, 2025
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Thanks!

@ShoyuVanilla ShoyuVanilla added this pull request to the merge queue Oct 10, 2025
Merged via the queue into rust-lang:master with commit 6342f3f Oct 10, 2025
15 checks passed
@rustbot rustbot removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 10, 2025
@A4-Tacks A4-Tacks deleted the add-ret-ty-adjusted branch October 10, 2025 12:16
@lnicola lnicola changed the title Fix closure coerced return type for add_return_type fix: handle closure return type adjustments in add_return_type Oct 14, 2025
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@ShoyuVanilla ShoyuVanilla ShoyuVanilla approved these changes

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@A4-Tacks @ShoyuVanilla @rustbot