update tcl/tk

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diff --git a/tcl8.6/doc/error.n b/tcl8.6/doc/error.n
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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH error n "" Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-error \- Generate an error
-.SH SYNOPSIS
-\fBerror \fImessage\fR ?\fIinfo\fR? ?\fIcode\fR?
-.BE
-
-.SH DESCRIPTION
-.PP
-Returns a \fBTCL_ERROR\fR code, which causes command interpretation to be
-unwound.  \fIMessage\fR is a string that is returned to the application
-to indicate what went wrong.
-.PP
-The \fB\-errorinfo\fR return option of an interpreter 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 the \fB\-errorinfo\fR
-return option.  If the \fIinfo\fR argument is present, it is
-used to initialize the \fB\-errorinfo\fR return options and
-the first increment of unwind information
-will not be added by the Tcl interpreter.
-In other
-words, the command containing the \fBerror\fR command will not appear
-in the stack trace; in its place will be \fIinfo\fR.
-Historically, this feature had been most useful in conjunction
-with the \fBcatch\fR command:
-if a caught error cannot be handled successfully, \fIinfo\fR can be used
-to return a stack trace reflecting the original point of occurrence
-of the error:
-.PP
-.CS
-catch {...} errMsg
-set savedInfo $::errorInfo
-\&...
-\fBerror\fR $errMsg $savedInfo
-.CE
-.PP
-When working with Tcl 8.5 or later, the following code
-should be used instead:
-.PP
-.CS
-catch {...} errMsg options
-\&...
-return -options $options $errMsg
-.CE
-.PP
-If the \fIcode\fR argument is present, then its value is stored
-in the \fB\-errorcode\fR return option.  The \fB\-errorcode\fR
-return option is intended to hold a machine-readable description
-of the error in cases where such information is available; see
-the \fBreturn\fR manual page for information on the proper format
-for this option's value.
-.SH EXAMPLE
-.PP
-Generate an error if a basic mathematical operation fails:
-.PP
-.CS
-if {1+2 != 3} {
-    \fBerror\fR "something is very wrong with addition"
-}
-.CE
-.SH "SEE ALSO"
-catch(n), return(n)
-.SH KEYWORDS
-error, exception
-'\" Local Variables:
-'\" mode: nroff
-'\" End: