[Issue 17477] DMD error message for delegate with wrong attributes is very confusing

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17477

--- Comment #6 from Eyal <eyal at weka.io> ---
Then perhaps instead of "void" it is better to spell out "template
instantiation failure, see below" as the type itself.

Verbose, maybe, but clearer how to progress

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