Eliminate functionally duplicate vtable methods on rustc 1.51+ #145
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Using the raw pointer addr_of macro, it's possible for the vtable methods to avoid instantiating any
&or&mutand operate only in terms of pointers, allowingDerefandDerefMutto reuse a single piece of vtable logic, anddowncast_refanddowncast_mutto reuse a single piece.Closes #62.
FYI @thomcc