Function field_representing_type_offset 

pub const fn field_representing_type_offset(_frt_type_id: TypeId) -> usize

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

Gets the name of the field represented by the FieldRepresentingType’s TypeId.

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