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Detecting and Recording Macro Errors
You can control how a macro responds when an error
occurs during execution. By creating and adding an onError macro to
your macro file, you can specify that, on the occurrence of an error,
macro execution within the current macro stops and the onError macro
is invoked. An onError macro can call other macros. If another error
occurs after the onError macro is invoked, macro execution stops again
and the onError macro is invoked again. This process continues either
until the onError macro completes or until reaching the recursion
limit of 10.
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