pub extern "rust-intrinsic" fn variant_count<T>() -> usize
Returns the number of variants of the type
T cast to a
T has no variants, returns
0. Uninhabited variants will be counted.
Note that, unlike most intrinsics, this is safe to call;
it does not require an
Therefore, implementations must not require the user to uphold
any safety invariants.
The to-be-stabilized version of this intrinsic is