Thank the Chez Scheme developers for an absolutely fantastic compiler, and also Idris for being designed so that it's possible to feed any of the IRs to the particular backend. There's not much of an impedance mismatch between Scheme and Idris lambda output, so the overhead is small. I could have made it a bit better if I had represented Idris lists and bools as the corresponding scheme types, instead of being mapped as all the other types by their structure.