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Proactive Synthesis of Recursive Tree-to-String Functions from Examples (Artifact) Mayer, Mikaël Hamza, Jad Kuncak, Viktor programming by example active learning program synthesis This artifact, named Prosy, is an interactive command-line tool for synthesizing recursive tree-to-string functions (e.g. pretty-printers) from examples. Specifically, Prosy takes as input a Scala file containing a hierarchy of abstract and case classes, and synthesizes the printing function after interacting with the user. Prosy first pro-actively generates a finite set of trees such that their string representations uniquely determine the function to synthesize. While asking the output for each example, Prosy prunes away questions when it can infer their answers from previous answers. In the companion paper, we prove that this pruning allows Prosy not to require that the user provides answers to the entire set of questions, which is of size O(n^3) where n is the size of the input file, but only to a reasonably small subset of size O(n). Furthermore, Prosy guides the interaction by providing suggestions whenever it can. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Mikaël Mayer and Jad Hamza and Viktor Kuncak 2017 Is Part Of DARTS, Volume 3, Issue 2, Special Issue of the 31st European Conference on Object-Oriented Programming (ECOOP 2017) Article Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DARTS.3.2.16 urn:nbn:de:0030-drops-72970 https://drops.dagstuhl.de/entities/document/10.4230/DARTS.3.2.16 eng https://creativecommons.org/licenses/by/3.0/de/legalcode