+/// `as` can be seen as the primitive for `From` and `Into`: `as` only works with primitives
+/// (`u8`, `bool`, `str`, pointers, ...) whereas `From` and `Into` also works with types like
+/// `String` or `Vec`.
+///
+/// `as` can also be used with the `_` placeholder when the destination type can be inferred. Note
+/// that this can cause inference breakage and usually such code should use an explicit type for
+/// both clarity and stability. This is most useful when converting pointers using `as *const _` or
+/// `as *mut _` though the [`cast`][const-cast] method is recommended over `as *const _` and it is
+/// [the same][mut-cast] for `as *mut _`: those methods make the intent clearer.
+///
+/// `as` is also used to rename imports in [`use`] and [`extern crate`][`crate`] statements: