FailureQ

gives True if expr has head Failure or is equal to $Failed or $Aborted.

Examples

open allclose all

Test whether an expression represents a "failure":

Select expressions that do not represent failure:

$Failed is returned when an operation cannot be performed:

Failure objects are returned by functions like Interpreter when they cannot produce a result:

$Aborted is returned when Abort[] executes or when the user manually aborts a computation:

The symbol Failure on its own does not represent failure:

Failure of a function to evaluate or the production of messages is not considered to represent failure:

Use Check to detect when an evaluation produces messages:

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