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clean up e0200 explanation #68340

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Jan 18, 2020
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clean up e0200 explanation #68340

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19 changes: 14 additions & 5 deletions src/librustc_error_codes/error_codes/E0200.md
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Original file line number Diff line number Diff line change
@@ -1,14 +1,23 @@
An unsafe trait was implemented without an unsafe implementation.

Erroneous code example:

```compile_fail,E0200
struct Foo;

unsafe trait Bar { }

impl Bar for Foo { } // error!
```

Unsafe traits must have unsafe implementations. This error occurs when an
implementation for an unsafe trait isn't marked as unsafe. This may be resolved
by marking the unsafe implementation as unsafe.

```compile_fail,E0200
```
struct Foo;

unsafe trait Bar { }

// this won't compile because Bar is unsafe and impl isn't unsafe
impl Bar for Foo { }
// this will compile
unsafe impl Bar for Foo { }
unsafe impl Bar for Foo { } // ok!
```