[Issue 17444] std.traits.isCallable doesn't recognize struct member function if return type is 'auto'.

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17444

--- Comment #2 from Dario Schiavon <dario.schiavon at gmail.com> ---
(In reply to uplink.coder from comment #1)
> This has to do with the order of symbol resolving.
> You will see that it will print good, if you put the static if outside of
> the struct body.

Thanks for the prompt answer. Do you mean that this is the intended behavior,
or is it still a bug?

I'll explain what I'm trying to achieve: a mixin template that will
automatically define a member function foo if it is not already present.
However, the fact that it works in some situations and not in others is mildly
annoying. Maybe you can suggest a better approach?

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