upvar

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upvar(3tcl)	referred by	global(3tcl) \| namespace(3tcl) \| set(3tcl) \| unset(3tcl) \| uplevel(3tcl) \| variable(3tcl)
upvar(3tcl)	refer to	global(3tcl) \| namespace(3tcl) \| uplevel(3tcl) \| variable(3tcl)