Check
 Usage
• Check[expr, failexpr] evaluates expr, and returns the result, unless messages were generated, in which case it evaluates and returns failexpr.
• Check[expr, failexpr,  :: ,  :: , ... ] checks only for the specified messages.
Notes
• Check tests only for messages that are actually output. It does not test for messages that have been suppressed using Off. • New in Version 1.
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