diff options
Diffstat (limited to 'src/doc/reference/src/attributes/type_system.md')
| -rw-r--r-- | src/doc/reference/src/attributes/type_system.md | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/doc/reference/src/attributes/type_system.md b/src/doc/reference/src/attributes/type_system.md index 729069d26..71b0243a6 100644 --- a/src/doc/reference/src/attributes/type_system.md +++ b/src/doc/reference/src/attributes/type_system.md @@ -127,6 +127,14 @@ match message { } ``` +It's also not allowed to cast non-exhaustive types from foreign crates. +```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 |