Proofs-as-Programs as a Framework for the Design of an Analogy-Based ML Editor

C^YNTHIA is a transformation-based editor for a functional subset of ML that lies somewhere between a structure editor and a framework for formal program development. Users construct programs from existing code by applying editing commands that make a semantic analysis of the program's behaviour, e.g., whether it is terminating. All analysis is done using the Oyster system, which is an implementation of proofs-as-programs. We concentrate on identifying analyses that can be done fully automatically (e.g., using a decision procedure) and hence can be hidden from the user. As a result, C^YNTHIA represents progress towards a goal of program editors that make an intelligent analysis of their code, but in a way that requires no extra input from the programmer.