Rush is a language derived from Tcl and was presented at the [1993 Tcl/Tk Workshop] and the [1994 Tcl/Tk Workshop]. Here is more information: http://number-none.com/blow/papers/rush_tcl94.pdf

The abstract of the paper says:

Rush is a new language that looks and feels much like Tcl [[?]]; we offer a compiler that executes scripts a hundred times faster than Tcl 7.x, allowing programs to run at speeds close to their [C]-language counterparts. Rush incorporates many features from Tcl and contains new features. From Tcl, Rush acquires its syntax, [everything is a string] model, set of core commands and datatypes, scoping rules, C callout facility, and support for popular libraries, including Tk and Tcl-DP. New features in Rush include pass-by-reference, first class [closures] and production rules. A generalization of operator syntax allows users to code in either command-style or operator-style syntax; a converter program provides a translation between the two forms. We introduce the language as a set of changes to Tcl, with a focus on performance issues and discussion of new features.


Does anyone use this today (2005)??

[dbohdan] 2014-11-10: Curiously, judging by the URL one of the authors of the paper on Rush is the same Jonathan Blow who went on to develop the programming language [http://web.archive.org/web/20140927014813/http://lerp.org/%|%Lerp] and the video game [https://en.wikipedia.org/wiki/Braid_%28video_game%29%|%Braid]. You can see a hint of  Tcl's influence in Lerp.

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