Replace uses of AliasType#types?
by Type#lookup_name
#15068
Merged
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Introduces
Type#lookup_name
as a dedicated mechanism for looking up a name in a namespace. This allows us to drop the override ofAliasType#types?
which delegated to the aliased type. Thus cyclic hierarchies are no longer possible and we can drop all code that was necessary only for handling that.Resolves #15066