[Issue 15323] Module.members and .deferred3 should use data structure with fast lookup

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15323

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
A better solution is have the template instance contain a field which has a
pointer to which members[] it is contained in (since it is never contained in
more than one).

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