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assert



    function
    boot.janet on line 152, column 1

    (assert x &opt err)

    Throw an error if x is not truthy.

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(var a 0)
(assert (pos? a) "A is definitely not positive")
# error: A is definitely not positive
#  in assert [boot.janet] on line 149, column 11
#  in _thunk [repl] (tailcall) on line 3, column 1

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