Function type_id_variant_name 

pub const fn type_id_variant_name(
    _base: TypeId,
    _variant_index: usize,
) -> &'static str

🔬This is a nightly-only experimental API. (core_intrinsics)

Gets the name of the variant represented by the base TypeId and variant_idx.

The more user-friendly version of this intrinsic is core::mem::type_info::VariantId::name.