null-environment -- r7rs Definition

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Kind

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procedure;

Implemented by

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• null-environment (from vonuvoli);

Procedure signature

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Procedure variants:

• ((eval-environment-version) -> (eval-environment))
  • input: a value of type eval-environment-version;
  • output: a value of type eval-environment;

Exports

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• scheme:r5rs -- (scheme r5rs);

Exports recursive

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• scheme -- (scheme);

Description

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(null-environment version)

If version is equal to 5, corresponding to R5RS, the null-environment procedure returns a specifier for an environment that contains only the bindings for all syntactic keywords defined in the R5RS library. Implementations must support this value of version.

Implementations may also support other values of version, in which case they return a specifier for an environment containing appropriate bindings corresponding to the specified version of the report. If version is neither 5 nor another value supported by the implementation, an error is signaled.

The effect of defining or assigning (through the use of eval) an identifier bound in a scheme-report-environment (for example car) is unspecified. Thus both the environment and the bindings it contains may be immutable.

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The text herein was sourced and adapted as described in the "R7RS attribution of various text snippets" appendix.

Referenced-types

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• eval-environment-version;
• eval-environment;