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| '''Summary'''
|Asserts that the effective boolean value of the specified {{Code|$test}} is true and returns an empty sequence. Otherwise, raises an error. The ''effective boolean value'' of an expression can be explicitly computed by using the {{Code|fn:boolean}} function.<br/>The default failure output message can be overridden with the {{Code|$info}} argument.
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| '''Errors'''
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| '''Summary'''
|Asserts that the specified arguments are equal according to the rules of the {{Code|fn:deep-equals}} function. Otherwise, raises an error.<br/>The default failure output message can be overridden with the {{Code|$info}} argument.
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| '''Errors'''
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| '''Summary'''
|Raises a unit error . The default failure message can be overridden with an optional failure itemthe {{Code|$info}} argument.
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| '''Errors'''
