[procedure] null-environment version

R5RS: Returns the environment specifier that represents an environment which only contains syntactic bindings of the version-th report of Scheme. In R5RS, only 5 is the valid number for version.

R6RS: This is moved to R5RS compatibility library (rnrs r5rs (6)). Only 5 is allowed as version. In R6RS, you can use environment instead.

See also eval, interaction-environment, scheme-report-environment.