|>||command||string||A Tcl command to be invoked when an error
is reported. The command will be appended with
an argument which is a string containing the error
message (if there are more than one error
messages they will be separated by newline
characters in the string). The flags -highlight,
-alarm and -bell may be appended if any of the
reported messages had those flags set.
If not supplied,
the handler is reset to output messages to stderr.
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