Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

#[non_exhaustive] on variant blocks cross-crate as casts #1249

Merged
merged 2 commits into from
Aug 16, 2022
Merged

#[non_exhaustive] on variant blocks cross-crate as casts #1249

Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
3036b18
cannot cast non-exhaustive enum from foreign crate
lambinoo Aug 14, 2022
bce9bb3
Update type_system.md
lambinoo Aug 16, 2022
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 8 additions & 0 deletions src/attributes/type_system.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -127,6 +127,14 @@ match message {
}
```

It's also impossible to cast non-exhaustive types from foreign crates.
lambinoo marked this conversation as resolved.
Show resolved Hide resolved
```rust, ignore
use othercrate::NonExhaustiveEnum;

// Cannot cast a non-exhaustive enum outside of its defining crate.
let _ = NonExhaustiveEnum::default() as u8;
```

Non-exhaustive types are always considered inhabited in downstream crates.

[_MetaWord_]: ../attributes.md#meta-item-attribute-syntax
Expand Down