[Issue 20916] hard to find where a deprecation comes from

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20916

uplink.coder at googlemail.com changed:

           What    |Removed                     |Added
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                 CC|                            |uplink.coder at googlemail.com

--- Comment #1 from uplink.coder at googlemail.com ---
In this case, the deprecation seems actually caused by a template-constraint
Which should evaluate the symbol in a speculative context.
We could keep track of context I guess ...

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