src/librustc_error_codes/error_codes/E0518.md

   1 An `#[inline(..)]` attribute was incorrectly placed on something other than a
   2 function or method.
   3
   4 Example of erroneous code:
   5
   6 ```compile_fail,E0518
   7 #[inline(always)]
   8 struct Foo;
   9
  10 #[inline(never)]
  11 impl Foo {
  12     // ...
  13 }
  14 ```
  15
  16 `#[inline]` hints the compiler whether or not to attempt to inline a method or
  17 function. By default, the compiler does a pretty good job of figuring this out
  18 itself, but if you feel the need for annotations, `#[inline(always)]` and
  19 `#[inline(never)]` can override or force the compiler's decision.
  20
  21 If you wish to apply this attribute to all methods in an impl, manually annotate
  22 each method; it is not possible to annotate the entire impl with an `#[inline]`
  23 attribute.