- scheme-report-environment versionprocedure
- null-environment versionprocedure
Version must be either the exact integer 4 or 5, corresponding to the respective revisions of the Scheme report (the Revised^N Report on Scheme). Scheme-report-environment returns a specifier for an environment that is empty except for all bindings defined in this report that are either required or both optional and supported by the implementation. Null-environment returns a specifier for an environment that is empty except for the (syntactic) bindings for all syntactic keywords defined in this report that are either required or both optional and supported by the implementation.
The environments specified by scheme-report-environment and null-environment are immutable.