ch19-04-advanced-types : Sized trait confusion #2422
Description
Near the end of the ch19-04-advanced-types.md:
A trait bound on ?Sized is the opposite of a trait bound on Sized: we would read this as “T may or may not be Sized.”
This is not describing the opposite, more like superset relation.
following immediately:
This syntax is only available for Sized, not any other traits.
It just described that it "may or may not be Sized" but then "only available for Sized" ...?