[Issue 19326] .tupleof sidesteps protection attributes

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19326

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
tupleof is known to break through private access protections. It should
probably not be allowed in @safe code.

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