He ditched the Scheme -> LLVM compiler in favor of a Scheme derived, statically typed sublanguage with C-like Arrays (ie as low level as possible) for its core

He ditched the Scheme -> LLVM compiler in favor of a Scheme derived, statically typed sublanguage with C-like Arrays (ie as low level as possible) for its core data structure. http://impromptu.moso.com.au/extras/ICR.html http://impromptu.moso.com.au/extras/ICR.html http://lists.moso.com.au/pipermail/impromptu/2010-October/000728.html http://lists.moso.com.au/pipermail/impromptu/2010-October/00... Imprompty won't be released as open source, but a subset of the code will probably be opened at some point in order to create a cross-platform alter-ego. http://lists.moso.com.au/pipermail/impromptu/2010-December/000785.html http://lists.moso.com.au/pipermail/impromptu/2010-December/0...