Comment broken test in std/traits.d

[RazvanN7]

This currently blocks: dlang/dmd#9585 . The test can be uncommented and fixed after the dmd PR is pulled

[dlang-bot]

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[wilzbach]

How about leaving a quick comment?

[wilzbach]

(just in case the DMD PR gets stuck)

[RazvanN7]

@wilzbach Good idea, thanks. Done.