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OpenDarwin 7.2.1 - man page for error (opendarwin section n)

error(n)			      Tcl Built-In Commands				 error(n)


       error - Generate an error

       error message ?info? ?code?

       Returns a TCL_ERROR code, which causes command interpretation to be unwound.  Message is a
       string that is returned to the application to indicate what went wrong.

       If the info argument is provided and is non-empty, it is used  to  initialize  the  global
       variable errorInfo.  errorInfo is used to accumulate a stack trace of what was in progress
       when an error occurred; as nested commands unwind, the Tcl interpreter adds information to
       errorInfo.   If	the  info argument is present, it is used to initialize errorInfo and the
       first increment of unwind information will not be added by the Tcl interpreter.	In  other
       words, the command containing the error command will not appear in errorInfo; in its place
       will be info.  This feature is most useful in conjunction with the  catch  command:  if	a
       caught  error  cannot  be  handled  successfully, info can be used to return a stack trace
       reflecting the original point of occurrence of the error:
	      catch {...} errMsg
	      set savedInfo $errorInfo
	      error $errMsg $savedInfo

       If the code argument is present, then its value is stored in the  errorCode  global  vari-
       able.   This  variable  is intended to hold a machine-readable description of the error in
       cases where such information is available; see the tclvars manual page for information  on
       the  proper  format for the variable.  If the code argument is not present, then errorCode
       is automatically reset to ``NONE'' by the Tcl interpreter as part of processing the  error
       generated by the command.

       catch(n), tclvars(n)

       error, errorCode, errorInfo

Tcl											 error(n)

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