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urbit.org/docs/programming/reference/runes/wt/wtgl.md
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1# `:deny`, `?<`, "wutgal" `{$deny p/twig q/twig}`
2====
4Assert `p` is false.
6Asserts that `p` is false before evaluating `q`. Crashes if `p` evaluates to false.
8Regular form: *2-fixed*
10Examples:
12 ~zod/try=> ?<(=(0x1 0) %foo)
13 %foo
14 ~zod/try=> ?<(=(0x1 1) %foo)
15 ! exit