[Issue 5137] Compiler tips

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=5137

Infiltrator <lt.infiltrator at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |lt.infiltrator at gmail.com

--- Comment #1 from Infiltrator <lt.infiltrator at gmail.com> ---
I don't know whether it's necessary to add another class of compiler messages. 
It might be enough to just make these warnings.  It would be helpful especially
useful for @nogc.

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