title: Tcl TCL_OK usage example
body: <p>Based on the help page for the Tcl <a href="http://www.tcl.tk/man/tcl8.4/TclCmd/catch.htm" rel="nofollow">catch</a> command, I was trying to use the specified result variables like <code>TCL_OK</code> or <code>TCL_ERROR</code>. However, there is some problem with the syntax of how those variables should be accessed. Does anyone have a code example that uses those variables instead of magic numbers?</p>