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  1. Proceedings of the 2016 7th ACM SIGPLAN Symposium on Scala (SCALA 2016)
  2. SMT-based checking of predicate-qualified types for Scala
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SMT-based checking of predicate-qualified types for Scala

Content Provider ACM Digital Library
Author Kuncak, Viktor Schmid, Georg Stefan
Abstract We present *qualified types* for Scala, a form of refinement types adapted to the Scala language. Qualified types allow users to refine base types and classes using predicate expressions. We implemented a type checker for qualified types that is embedded in Scala's next-generation compiler Dotty and delegates constraint checking to an SMT solver. Our system supports many of Scala's functional as well as its object-oriented constructs. To propagate user-provided qualifier ascriptions we utilize both Scala's own type system and an incomplete, but effective qualifier inference algorithm. Our evaluation shows that for a series of examples exerting various of Scala's language features, the additional compile-time overhead is manageable. By combining these features we show that one can verify essential safety properties such as static bounds-checks while retaining several of Scala's advanced features. .
Starting Page 31
Ending Page 40
Page Count 10
File Format PDF
ISBN 9781450346481
DOI 10.1145/2998392.2998398
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2016-10-30
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Refinement types Scala
Content Type Text
Resource Type Article
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