6.9 Single-Unit Modules
When scheme/unit is used as a language name with #lang, the module body is treated as a unit body. The body must match the following module-body grammar:
module-body  | 
  | =  | 
  | 
  | ||||||
  | 
  | 
  | 
  | 
  | ||||||
require-decl  | 
  | =  | 
  | (require require-spec ...)  | ||||||
  | 
  | |  | 
  | (begin require-decl ...)  | ||||||
  | 
  | |  | 
  | derived-require-form  | 
After any number of require-decls, the content of the module is the same as a unit body.
The resulting unit is exported as base@, where base is derived from the enclosing module’s name (i.e., its symbolic name, or its path without the directory and file suffix). If the module name ends in -unit, then base corresponds to the module name before -unit. Otherwise, the module name serves as base.