husk-scheme-3.18: R5RS Scheme interpreter, compiler, and library.

husk-scheme-3.18: R5RS Scheme interpreter, compiler, and library.

Husk is a dialect of Scheme written in Haskell that implements a superset of the R5RS standard. Advanced features are provided including:

  • First-class continuations of unlimited extent
  • Hygienic macros based on syntax-rules
  • Low-level explicit renaming macros
  • Library syntax from the R7RS standard
  • A foreign function interface (FFI) to Haskell
  • Full numeric tower providing support for real, rational, and complex numbers
  • Proper tail recursion and lexical scoping
  • Read-Eval-Print-Loop (REPL) interpreter, with input driven by Haskeline to provide a rich user experience
  • Standard library of Scheme functions, and support for many popular SRFI's

Husk may be used as either a stand-alone interpreter or as an extension language within a larger Haskell application. By closely following the R5RS standard, the intent is to develop a Scheme that is as compatible as possible with other R5RS Schemes. Husk is mature enough for use in production, however it is not optimized for performance-critical applications.

Scheme is one of two main dialects of Lisp. Scheme follows a minimalist design philosophy: the core language consists of a small number of fundamental forms which may be used to implement other built-in forms. Scheme is an excellent language for writing small, elegant programs, and may also be used to write scripts or embed scripting functionality within a larger application.

For documentation and examples, see

For detailed information on each release, see