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D - Elegant compiler and front-end generator

http://www.extra.research.philips.com/elegant

"Elegant started as a compiler generator based on attributed grammars
.. and has grown into a full programming language. Although it has
been inspired by the abstraction mechanisms found in modern functional
languages, Elegant is an imperative language that does not discourage
side-effects.

"Elegant is written in Elegant ... and has been used for internal use
within Philips for about 15 years now. In this period, dozens of
compilers have been built with Elegant. Elegant release 7 is
distributed under the Gnu General Public License."
Feb 19 2003