4 R6RS Module Language

▼ |  | R6RS: Scheme

1 | Using R6RS with Dr Racket
2 | Running Top-Level Programs
3 | Installing Libraries
4 | R6RS Module Language
5 | Libraries and Collections
6 | Language Interoperability
7 | R6RS Conformance
8 | R6RS Libraries
| Index

► | 4 | R6RS Module Language

4.1 | Using R6RS
4.2 | The Implementation of R6RS

On this page:

4.1 Using R6RS
4.2 The Implementation of R6RS
#%module-begin

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## 4 R6RS Module Language🔗ℹ

#lang r6rs | package: r6rs-lib

The r6rs language is usually used in the form #!r6rs, which is equivalent to #lang r6rs and is also valid R6RS syntax.

### 4.1 Using R6RS🔗ℹ

See Using R6RS with DrRacket, Running Top-Level Programs, and Installing Libraries for more information on writing and running R6RS programs with Racket.

### 4.2 The Implementation of R6RS🔗ℹ

The R6RS language is itself implemented as a module within Racket. The details of that implementation, as provided in this section, are not normally relevant to programmers using R6RS; see the links in Using R6RS, instead. The details may be relevant to programmers who are developing new tools or deriving variants of R6RS within Racket.

As a Racket module, the r6rs module language provides only a #%module-begin binding, which is used to process the entire body of a Racket module (see module). The #%module-begin binding from r6rs allows the body of a module to use the syntax of either a R6RS library or a R6RS top-level program.

> > syntax
> > (#%module-begin
> > (library library-name
> > (export export-spec ...)
> > (import import-spec ...)
> > library-body ...))
> (#%module-begin
> (import import-spec ...)
> program-body ...)

An r6rs module that contains a single library form defines an R6RS library, while a module body that starts with an import form defined an R6RS top-level program.

The library, export, and import identifiers are not exported by the r6rs library; they are recognized through equivalence to unbound identifiers.

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