[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 #4 from Eyal <eyal at weka.io> ---
With the fix for issue #10602 - it sounds much better, though even then I don't
think the error should say:

  function `lambdaarg.f(void delegate(int) nothrow dlg)` is not callable using
argument types `(void)`

but rather:

  function `lambdaarg.f(void delegate(int) nothrow dlg)` is not callable using
given template, as it failed to instantiate:

And this is much clearer direction for the programmer to read the actual
problem on the next line.

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