I think I need to define what is meant by turn-key compiler. That is what they called it in JForth. In Perl this same feature goes by the term "packed archive" and in LabVIEW they call it a "built application". It is a feature in those languages whereby you can issue an standalone *.exe having within itself, complete unto itself, all that is needed to run the script, program, application. The output appears as a single file to the end user with the expected extension of *.exe but functions in fact more like those ZIP installers which also come with *.exe extensions. The size will be bloated, since packed archive has within it all from the parent language, modules included, that are needful to run the script, at least for Perl. For JForth it was much the same. For LabVIEW the output of a "build" requires to have the "runtime engine" installed, but which, once installed, is good for ALL applictions and will run them but not allow editing. So, it would be something to allow an author to issue programs which end-users would NOT have to know anything about Haskell itself and would have to, at most, perform a two-step, wholly automatic installation procedure. Short of this, anything I might aspire to give away free to the public en masse, could not conceivably be written in Haskell. In which case, I'll respectfully bow out from endeavoring to learn it myself, however useful it serves for many another purpose.