Commit d9b128a7 authored by Robbert Krebbers's avatar Robbert Krebbers

Remove `:>>` subclass instance declarations

There are not documented in
https://coq.inria.fr/refman/addendum/type-classes.html?highlight=class#coq:cmd.class,
and they don't have any advantage, so it's better to stop using them.
parent c6eed539
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