[Issue 20828] __traits(getFunctionAttributes) doesn't support "scope"

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20828

--- Comment #1 from Atila Neves <atila.neves at gmail.com> ---
Similar to https://issues.dlang.org/show_bug.cgi?id=14874 but trying its fix
didn't work.

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