Reword first sentence to be more specific.

mixy1 · obi1kenobi · web-flow · commit efdf702385be · 2024-09-09T23:47:47.000+02:00
Co-authored-by: Predrag Gruevski &lt;2348618+obi1kenobi@users.noreply.github.com&gt;
diff --git a/src/attributes/type_system.md b/src/attributes/type_system.md
@@ -163,7 +163,7 @@ match message {
 }
 ```
 
-However, casting non-exhaustive types from foreign crates is generally disallowed, except when dealing with enums that have no non-exhaustive variants.
+It's also not allowed to use numeric casts (`as`) on enums that contain any non-exhaustive variants.
 
 For example, the following enum can be cast because it doesn't contain any non-exhaustive variants:
 ```rust, ignore

Original file line number	Diff line number	Diff line change
`@@ -163,7 +163,7 @@ match message {`
`163`	`163`	`}`
`164`	`164`	```
`165`	`165`
`166`		`-However, casting non-exhaustive types from foreign crates is generally disallowed, except when dealing with enums that have no non-exhaustive variants.`
	`166`	+It's also not allowed to use numeric casts (`as`) on enums that contain any non-exhaustive variants.
`167`	`167`
`168`	`168`	`For example, the following enum can be cast because it doesn't contain any non-exhaustive variants:`
`169`	`169`	```rust, ignore