Husk is an implementation of the Scheme programming language for the Haskell Platform. Advanced R5RS features are provided, including continuations, hygienic macros, and a full numeric tower.
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This release includes major improvements to the macro module. In particular, husk now supports arbitrary nesting levels of macro 0-or-many matches and macros now correctly handle improper lists. The parser has also been updated to simplify improper lists. For example, '(1 2 . (3 . ())) will now be converted to (1 2 3).
Significant improvements were made to the parser, including proper handling of whitespace and comments. This represents a critical upgrade from the previous releases. In addition, support was added for nested block comments using #| and |#, per the R7RS draft. Hash-table-fold was also added.
Issues with lexical scoping of special forms were fixed. "cond", "and", and "or" were implemented using the corresponding macros from R5RS. A gensym primitive was added. Macro support was marked as non-hygienic since hygiene is not fully supported at present.
