:   '''try_eval''' ''code catch'' ?''finally''?

The '''try_eval''' command evaluates ''code'' in the current
context.

If an error occurs during the evaluation and ''catch'' is  not
empty,  then ''catch'' is evaluated to handler the error.  The
result of the command, containing the error message,  will
be  stored  in  a global variable `errorResult`.  The global
variables `errorResult`, `[errorInfo]`  and  `[errorCode]`  will  be
imported  into the current scope, there is no need to exe-
cute a [global] command.  The result of  the  ''catch''  command
becomes  the result of the '''try_eval''' command.  If the error
that caused the ''catch'' to be evaluate is to  be  continued,
the following command should be used:
 error $errorResult $errorCode $errorInfo

If  the  ''finally'' argument is supplied and not empty, it is
evaluated after the evaluation of the ''code'' and  the  ''catch''
commands.  If an error occurs during the evaluation of the
''finally'' command, it becomes the  result  of  the  '''try_eval'''
command.   Otherwise,  the result of either ''code''  or ''catch''
is preserved, as described above.

[TclX] provides '''try_eval'''.

----
Superseded by [try] in Tcl 8.6.

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