[Issue 18609] `is` expression identifier accessible outside `static if`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18609

ZombineDev <petar.p.kirov at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |petar.p.kirov at gmail.com

--- Comment #1 from ZombineDev <petar.p.kirov at gmail.com> ---
`static if` doesn't create a scope, so I think the current behavior is correct,
though a bit suprising.

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