Error code E0518
An #[inline(..)]
attribute was incorrectly placed on something other than a
function or method.
Example of erroneous code:
#![allow(unused)] fn main() { #[inline(always)] struct Foo; #[inline(never)] impl Foo { // ... } }
#[inline]
hints the compiler whether or not to attempt to inline a method or
function. By default, the compiler does a pretty good job of figuring this out
itself, but if you feel the need for annotations, #[inline(always)]
and
#[inline(never)]
can override or force the compiler's decision.
If you wish to apply this attribute to all methods in an impl, manually annotate
each method; it is not possible to annotate the entire impl with an #[inline]
attribute.