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Update E0562 to account for the new impl trait positions #144816

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Aug 4, 2025
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Update E0562 to account for the new impl trait positions #144816

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9 changes: 4 additions & 5 deletions compiler/rustc_error_codes/src/error_codes/E0562.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,4 @@
Abstract return types (written `impl Trait` for some trait `Trait`) are only
allowed as function and inherent impl return types.
`impl Trait` is only allowed as a function return and argument type.

Erroneous code example:

Expand All @@ -14,7 +13,7 @@ fn main() {
}
```

Make sure `impl Trait` only appears in return-type position.
Make sure `impl Trait` appears in a function signature.

```
fn count_to_n(n: usize) -> impl Iterator<Item=usize> {
Expand All @@ -28,6 +27,6 @@ fn main() {
}
```

See [RFC 1522] for more details.
See the [reference] for more details on `impl Trait`.

[RFC 1522]: https://github.com/rust-lang/rfcs/blob/master/text/1522-conservative-impl-trait.md
[reference]: https://doc.rust-lang.org/stable/reference/types/impl-trait.html
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