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Soft Scheme: Practical soft type system for Scheme.

Soft Scheme provides the benefits of static typing for dynamically typed Scheme. Like a static type checker, a soft type checker infers types for variables and expressions. But rather than reject programs containing untypable fragments, a soft type checker inserts explicit run-time checks to transform untypable programs to typable form. These run-time checks indicate potential program errors, enabling programmers to detect errors prior to program execution. Soft type checking minimizes the number of run-time checks in the compiled code, enabling dynamically typed languages to attain the efficiency of statically typed languages like ML.
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Version: 0.08 (11-JAN-94) Ports: Tested in Chez Scheme and SCM. Should run in any R4RS Scheme. Copying: Copyright (c) 1993 by Andrew K. Wright. Use for educational and experimental purposes is permitted. Modifications must be returned to the author. CD-ROM: Prime Time Freeware for AI, Issue 1-1 Author(s): Andrew Wright Keywords: Authors!Wright, Rice University, Scheme!Code, Scheme!Extensions, Soft Scheme, Static Typing, Type Checking References: Andrew K. Wright and Robert Cartwright, "A practical soft type system for Scheme", Rice University Technical Report TR93-218, December 6, 1993.
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