[Issue 11577] Template std.typetuple.NoDuplicates removes const types for classes and structs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=11577

--- Comment #1 from alex.jercaianu at gmail.com ---
What would be the correct behaviour here?
Should it treat the const and nonconst as duplicates?

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