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DOI: 10.4230/LIPIcs.SNAPL.2017.17
Migratory Typing: Ten Years Later

Authors: Sam Tobin-Hochstadt, Matthias Felleisen, Robert Findler, Matthew Flatt, Ben Greenman, Andrew M. Kent, Vincent St-Amour, T. Stephen Strickland, and Asumu Takikawa

Published in: LIPIcs, Volume 71, 2nd Summit on Advances in Programming Languages (SNAPL 2017)

Abstract
In this day and age, many developers work on large, untyped code repositories. Even if they are the creators of the code, they notice that they have to figure out the equivalent of method signatures every time they work on old code. This step is time consuming and error prone. Ten years ago, the two lead authors outlined a linguistic solution to this problem. Specifically they proposed the creation of typed twins for untyped programming languages so that developers could migrate scripts from the untyped world to a typed one in an incremental manner. Their programmatic paper also spelled out three guiding design principles concerning the acceptance of grown idioms, the soundness of mixed-typed programs, and the units of migration. This paper revisits this idea of a migratory type system as implemented for Racket. It explains how the design principles have been used to produce the Typed Racket twin and presents an assessment of the project's status, highlighting successes and failures.
Cite as

Sam Tobin-Hochstadt, Matthias Felleisen, Robert Findler, Matthew Flatt, Ben Greenman, Andrew M. Kent, Vincent St-Amour, T. Stephen Strickland, and Asumu Takikawa. Migratory Typing: Ten Years Later. In 2nd Summit on Advances in Programming Languages (SNAPL 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 71, pp. 17:1-17:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{tobinhochstadt_et_al:LIPIcs.SNAPL.2017.17,
  author =	{Tobin-Hochstadt, Sam and Felleisen, Matthias and Findler, Robert and Flatt, Matthew and Greenman, Ben and Kent, Andrew M. and St-Amour, Vincent and Strickland, T. Stephen and Takikawa, Asumu},
  title =	{{Migratory Typing: Ten Years Later}},
  booktitle =	{2nd Summit on Advances in Programming Languages (SNAPL 2017)},
  pages =	{17:1--17:17},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-032-3},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{71},
  editor =	{Lerner, Benjamin S. and Bod{\'\i}k, Rastislav and Krishnamurthi, Shriram},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.SNAPL.2017.17},
  URN =		{urn:nbn:de:0030-drops-71202},
  doi =		{10.4230/LIPIcs.SNAPL.2017.17},
  annote =	{Keywords: design principles, type systems, gradual typing}
}
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