There may be many ''handler''s, each of which is described by 4 words. There are currently two types of handler defined:

   '''on''' ''code variableList script'':   Exact matching of the exception code (i.e. the value returned by a [catch]).
   '''trap''' ''errorPrefixList variableList script'':   List-prefix matching of the [errorcode].
** Documentation **


***Manual Page***
http://www.tcl.tk/man/tcl8.6/TclCmd/try.htm

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