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With the growing popularity of dynamic languages such as Lisp, Python, and the .NET Framework’s upcoming release of its Dynamic Language Runtime (DLR), we’re taking another step of neoteny. Instead of a compiler generating instruction byte codes, a “compiler for any dynamic language implemented on top of the DLR has to generate DLR abstract trees, and hand it over to the DLR libraries” (per Wikipedia). These abstract syntax trees (AST), normally an intermediate artifact created deep within the bowels of a traditional compiler (and eventually discarded), are now persisted as compiler output.