18.4 Interactive Module Loading
The bindings documented in this section are provided by the racket/enter and racket/init libraries, which means that they are available when the Racket executable is started with no command-line arguments. They are not provided by racket/base or racket.
Intended for use in a REPL, such as when mzscheme is
started in interactive mode. When a module-path is provided
(in the same sense as for require), the corresponding module
is loaded or invoked, and the current namespace is changed to
the body of the module via module->namespace. When
#f is provided, then the current namespace is restored
to the original one.
If invoking module-path requires loading any files, then modification dates of the files are recorded. If the file is modified, then a later enter! re-loads the module from source; see also Module Re-declarations. Similarly if a later enter! transitively requires a modified module, then the required module is re-loaded. Re-loading support works only for modules that are first loaded (either directly or indirectly through transitive requires) via enter!.
After switching namespaces to the designated module, enter! automatically requires racket/enter into the namespace, so that enter! can be used to switch namespaces again.
When it loads or re-loads a module from a file, enter! prints a message to (current-error-port).