Structs should not contain pointers to internal data

[Saurabh Das]

Thank you @Ali and @Jonothan!

So essentially since I will be storing a pointer, Telemetry!(T) is NOT safe
to use only with structs in general.

If I have something like:

struct UsefulStruct2
{
    this(this) @disable;
    this(UsefulStruct2) @disable;
  this(ref const(UsefulStruct2)) @disable;
  ref UsefulStruct2 opAssign(UsefulStruct2) @disable;
  ref UsefulStruct2 opAssign(ref const(UsefulStruct2)) @disable;

    int importantValue;
    auto tel1 = Telemetry!int(importantValue);
}

Does that ensure that UsefulStruct2 is not relocateable and thus I can
safely store a pointer to importantValue?

If not, what constraints do I need to add to my classes to ensure that I
don't run into subtle bugs when structs relocate?

Regards,
Saurabh Das
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