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Peter McGoron edited this page 2026年05月24日 04:07:56 +02:00

Table of Contents

Contents

Foundations
Batteries
Environments

Committees
Previous Scheme reports

R7RS small (2013)
R6RS (2007)
R5RS (1998)
R4RS (1991)
R3RS (1986)
RRRS (R2RS, 1985)
RRS (R1RS, 1978)
Report on Scheme (1975)

Welcome to the WG2 for the development of the R7RS Large programming language!

The R7RS Large will be the next iteration of the Scheme programming language, designed to meet the needs of practical, mainstream software development.

Anyone can help! If you write Scheme code, please give us feedback on issues and potential features. We frequently discuss things in #scheme on libera.chat, which is where we also have meetings.

To learn about how WG2 works, you can read the Process document. You can join the discussion by commenting on our issue tracker. You can see the agendas and minutes of our meetings here. If you're interested in joining, add your name to WG2 Members and join the mailing list to learn about and coordinate meeting times. (People without Google accounts can join by sending an email to scheme-reports-wg2+subscribe[AT]googlegroups.com.)

You may care to peruse the FAQ.

The specification for R7RS Large will be delivered in three volumes:

Foundations

Detail the core language semantics which implementations have to support directly. Target completion date 2028. (Roadmap) (Draft Table of Contents) (Outstanding issues)

Public drafts

The development of the Foundations is split up into Fascicles, which focus on specific areas like the macro system, primitives, and record types. The Fascicles will eventually be combined into a single document, which will be the Foundations.

The fascicles are:

The Macrological Fascicle: The macro system. Definition of macro expansion, identifiers, hygiene, and specification of syntax-rules, syntax-case, and operations on identifiers.
The Procedure Fascicle: Basic syntax for procedural programming. Definitions of lambda, define, etc. (Outstanding issues)
The Valued Fascicle: Basic data types. Definitions of pairs, vectors, strings, bitvectors, etc. (Outstanding issues) (Unofficial DocBook Conversion).
The Erroneous Fascicle: The behavior of Scheme when an error is encountered. Defines the condition system and the exceptions raised on bad applications. (Outstanding issues)
The Bibliothecarial Fascicle: The library system. The R7RS's define-library, the R6RS's library, and the semantics of library composition. (Outstanding issues)
The Flow-Controlling Fascicle: Continuations. Definition of call/cc, delimited continuations, continuation marks, etc. (Outstanding issues)
The Record-Winning Fascicle: The record-type system. Ways to define and compose data types disjoint from each other and from other Scheme objects. (Outstanding issues).

Batteries

Provides a reasonably comprehensive standard library of the kinds of things Lisp programmers are used to having available in their favourite dialects/implementations. Currently no target for completion.

(Outstanding issues)