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Sets or retrieves the entryref to be executed when an M program execution error occurs under FreeM-style or DSM 2.0-style error processing.
In FreeM-style error processing, $ZTRAP is specific to each program execution stack level.
In DSM 2.0-style error processing, $ZTRAP is the same for all program execution stack levels.
When FreeM encounters an error, if $ZTRAP is nonempty and $ETRAP is empty, FreeM will perform an implicit GOTO to the entryref indicated in $ZTRAP.
If $ETRAP is nonempty when FreeM encounters an error, the value of $ZTRAP is ignored, whether FreeM-style or DSM 2.0-style error processing is enabled.
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