[Issue 23057] importC: dmd segfault on invalid syntax

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23057

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
(In reply to Walter Bright from comment #1)
> I think this was taken care of in the stable branch.

Oh well, it wasn't.

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