src/librustc_error_codes/error_codes/E0379.md

   1 A trait method was declared const.
   2
   3 Erroneous code example:
   4
   5 ```compile_fail,E0379
   6 #![feature(const_fn)]
   7
   8 trait Foo {
   9     const fn bar() -> u32; // error!
  10 }
  11 ```
  12
  13 Trait methods cannot be declared `const` by design. For more information, see
  14 [RFC 911].
  15
  16 [RFC 911]: https://github.com/rust-lang/rfcs/pull/911