* generic/tclBasic.c:

	* generic/tclBinary.c:
	* generic/tclCmdAH.c:
	* generic/tclCmdIL.c:
	* generic/tclCmdMZ.c:
	* generic/tclExecute.c:
	* generic/tclLink.c:
	* generic/tclMain.c:
	* generic/tclProc.c:
	* generic/tclScan.c:
	* generic/tclTest.c:
	* generic/tclVar.c:
	* mac/tclMacInit.c:
	* unix/tclUnixInit.c:
	* win/tclWinInit.c: Insure that the core never calls TclPtrSetVar,
	Tcl_SetVar2Ex, Tcl_ObjSetVar2 or Tcl_SetObjErrorCode with a 0-ref
	new value. It is not possible to handle error returns correctly in
	that case [Bug 1334947], one has the choice of leaking the object
	in some cases, or else risk crashing in some others.

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