Those two are const fn and do not have any arguments. Inlining
helps reducing generated code size in debug builds.
/// ```
///
/// [alignment]: ./fn.align_of.html
-#[inline]
+#[inline(always)]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_promotable]
pub const fn size_of<T>() -> usize {
///
/// assert_eq!(4, mem::align_of::<i32>());
/// ```
-#[inline]
+#[inline(always)]
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_promotable]
pub const fn align_of<T>() -> usize {