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Reword E0492 #30111

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Nov 30, 2015
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Reword E0492 #30111

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6 changes: 3 additions & 3 deletions src/librustc/diagnostics.rs
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Expand Up @@ -1950,9 +1950,9 @@ const E: &'static Cell<usize> = &D.a; // error
const F: &'static C = &D; // error
```

This is because cell types internally use `UnsafeCell`, which isn't `Sync`.
These aren't thread safe, and thus can't be placed in statics. In this case,
`StaticMutex` would work just fine, but it isn't stable yet:
This is because cell types do operations that are not thread-safe. Due to this,
they don't implement Sync and thus can't be placed in statics. In this
case, `StaticMutex` would work just fine, but it isn't stable yet:
https://doc.rust-lang.org/nightly/std/sync/struct.StaticMutex.html

However, if you still wish to use these types, you can achieve this by an unsafe
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