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2.1 Standard conformance

Gauche conforms "Revised^5 Report of Algorithmic Language Scheme," including optional syntax and procedures, except the following features.

Gauche also supports the following SRFIs (Scheme Request for Implementation).

SRFI-0, Feature-based conditional expansion construct.
As an autoloaded macro. See section 10.1 srfi-0 - Feature conditional.

SRFI-1, List library.
Supported by the module srfi-1. See section 10.2 srfi-1 - List library. (Some of SRFI-1 procedures are built-in).

SRFI-2, AND-LET*: an AND with local bindings, a guarded LET* special form.
Supported by the module srfi-2. See section 10.3 srfi-2 - And-let*.

SRFI-4, Homogeneous numeric vector datatypes.
The module gauche.uvector provides a superset of srfi-4 procedures, including arithmetic operations and generic interface on the SRFI-4 vectors. See section 9.24 gauche.uvector - Uniform vectors.

SRFI-6, Basic String Ports.
SRFI-6 procedures are built-in. See section 6.18.4 String ports.

SRFI-8, receive: Binding to multiple values.
Syntax receive is built-in. See section 4.6 Binding constructs.

SRFI-9, Defining record types.
Supported by the module srfi-9. See section 10.5 srfi-9 - Record types.

SRFI-10, Sharp-comma external form.
Built-in. See section Read-time constructor.

SRFI-11, Syntax for receiving multiple values.
Supported by the module srfi-11. See section 10.6 srfi-11 - Let-values.

SRFI-13, String library
Supported by the module srfi-13. See section 10.7 srfi-13 - String library. (Some of SRFI-13 procedures are built-in).

SRFI-14, Character-set library
Character-set object and a few SRFI-14 procedures are built-in. See section 6.9 Character Set. Complete set of SRFI-14 is supported by the module srfi-14. See section 10.8 srfi-14 - Character-set library.

SRFI-17, Generalized set!
Built-in. See section 4.4 Assignments.

SRFI-18, Multithreading support
Some SRFI-18 features are built-in, and the rest is in gauche.threads module. See section 9.22 gauche.threads - Threads.

SRFI-19, Time Data Types and Procedures.
Time data type is Gauche built-in (See section SRFI time). Complete set of SRFI-19 is supported by the module srfi-19. See section 10.9 srfi-19 - Time data types and procedures.

SRFI-22, Running Scheme scripts on Unix
Supported. See section 3.4 Writing Scheme scripts.

SRFI-23, Error reporting mechanism.
Built-in. See section 6.16.1 Signalling errors.

SRFI-25, Multi-dimensional array primitives.
Supported by the module gauche.array, which defines superset of SRFI-25. See section 9.1 gauche.array - Arrays.

SRFI-26, Notation for specializing parameters without currying.
As an autoloaded macro. See section 4.3 Making Procedures.

SRFI-27, Sources of Random Bits.
Supported by the module srfi-27. See section 10.10 srfi-27 - Sources of Random Bits.

SRFI-28, Basic format strings.
Gauche's built-in format procedure is a superset of SRFI-28 format. See section 6.18.7 Output.

SRFI-30, Nested multi-line comments.
Supported by the native reader. See section 4.1 Lexical structure.

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