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A trait implementation was marked as unsafe while the trait is safe.
Erroneous code example:
```compile_fail,E0199
struct Foo;
trait Bar { }
unsafe impl Bar for Foo { } // error!
```
Safe traits should not have unsafe implementations, therefore marking an
implementation for a safe trait unsafe will cause a compiler error. Removing
the unsafe marker on the trait noted in the error will resolve this problem:
```
struct Foo;
trait Bar { }
impl Bar for Foo { } // ok!
```
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