Type Alias DisplayFnWide 

pub type DisplayFnWide = for<'mem> unsafe fn(value: PtrConstWide<'mem>, f: &mut Formatter<'_>) -> Result;

Function to format a value for display (wide pointer version)

If both DisplayFnWide and ParseFn are set, we should be able to round-trip the value.

Safety

The value parameter must point to aligned, initialized memory of the correct type.