Features

This page summarizes the Scheme language features implemented by Cyclone.

R⁷RS Compliance

This is the status of features implemented from the R⁷RS Scheme Specification:

Section	Status	Comments
2.2 Whitespace and comments	Partial	No datum or block comments
2.3 Other notations
2.4 Datum labels	No
3.1 Variables, syntactic keywords, and regions
3.2 Disjointness of types	Yes
3.3 External representations
3.4 Storage model		No immutable types at this time.
3.5 Proper tail recursion	Yes
4.1 Primitive expression types
4.2 Derived expression types
4.3 Macros
5.1 Programs	Yes
5.2 Import declarations
5.3 Variable definitions	Partial	`define-values` is not implemented yet.
5.4 Syntax definitions
5.5 Record-type definitions
5.6 Libraries	Partial	Support is "good enough" but need to make it more robust
5.7 The REPL	Yes
6.1 Equivalence predicates	Yes	`eqv?` is not implemented, it is just an alias to `eq?`
6.2 Numbers	Partial	Integers and reals are supported, but most numeric functions are missing at this time.
6.3 Booleans	Yes	`#true` and `#false` are not recognized by parser.
6.4 Pairs and lists	Yes	`member` functions are predicates, `member` and `assoc` do not accept `compare` argument.
6.5 Symbols	Yes
6.6 Characters	Partial	No unicode support, `char-ci` predicates are not implemented.
6.7 Strings	Partial	Many functions are missing. Need to sync up with r7rs.
6.8 Vectors	Yes
6.9 Bytevectors
6.10 Control features
6.11 Exceptions	Partial	Need to check against r7rs
6.12 Environments and evaluation	Partial
6.13 Input and output
6.14 System interface

Cyclone also supports several non-standard features: