http://core.tcl.tk/tcllib/doc/trunk/embedded/www/tcllib/files/modules/control/control.html

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Background: module contains a place to find flow or other control constructs that developers may find useful (or at least familar from other language contexts).

   * [assert]
   * [do]
   * [no-op]

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%| [Category Package], subset [Tcllib] | [Category Control Structure] |%
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