src/librustc_error_codes/error_codes/E0199.md

   1 A trait implementation was marked as unsafe while the trait is safe.
   2
   3 Erroneous code example:
   4
   5 ```compile_fail,E0199
   6 struct Foo;
   7
   8 trait Bar { }
   9
  10 unsafe impl Bar for Foo { } // error!
  11 ```
  12
  13 Safe traits should not have unsafe implementations, therefore marking an
  14 implementation for a safe trait unsafe will cause a compiler error. Removing
  15 the unsafe marker on the trait noted in the error will resolve this problem:
  16
  17 ```
  18 struct Foo;
  19
  20 trait Bar { }
  21
  22 impl Bar for Foo { } // ok!
  23 ```