[Issue 12429] SIMD vector type errors are too eager

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12429

--- Comment #3 from Vladimir Panteleev <thecybershadow at gmail.com> ---
The error is emitted from the glue layer, so as I understand it is impossible
to "catch" using is().

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