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### `abort` ###

    -> Tests for functionality "Evaluate core Robin Expression"

`abort` evaluates its argument to obtain a value _x_, then produces
an abort value with _x_ as its payload.

See the Robin specification for the expected behaviour of abort values.

For the sake of usability, the abort should include a message which
refers to the condition that triggered it, but this is not a strict

    | (abort 999999)
    ? abort 999999

`abort`'s single argument may be any kind of value, but `abort` expects
exactly one argument.

    | (abort)
    ? abort (illegal-arguments ())

    | (abort 2 3 4)
    ? abort (illegal-arguments (2 3 4))


(require abort)