:std/assert module provides the
assert! macro which can be used to certify certain
conditions in a program and fail with a useful error message if the condition is not satisfied.
To use the bindings from this module:
(assert! condition-expr [message-expr extra-expr ...])
Raises an error when the
condition-expr evaluates to false.
extra-exprs are provided, their
values will be included in the error message.
> (assert! #f) *** ERROR -- Assertion failed (console)@9.10: #f > (assert! (< 42 0) "that's an impossibility") *** ERROR -- Assertion failed that's an impossibility: (< 42 0) 42 => 42 0 => 0