Macro static_assertions::assert_impl_any

macro_rules! assert_impl_any {
    ($x:ty: $($t:path),+ $(,)?) => { ... };
}

Asserts that the type implements any of the given traits.

See assert_not_impl_any! for achieving the opposite effect.

Examples

u8 cannot be converted from u16, but it can be converted into u16:

assert_impl_any!(u8: From<u16>, Into<u16>);

The unit type cannot be converted from u8 or u16, but it does implement Send:

assert_impl_any!((): From<u8>, From<u16>, Send);

The following example fails to compile because raw pointers do not implement Send or Sync since they cannot be moved or shared between threads safely:

assert_impl_any!(*const u8: Send, Sync);