[Bug-kawa] [bug #47433] Strange Environment when kawa.repl is passed a file without -f

[Per Bothner]

Update of bug #47433 (project kawa):

                  Status:                    None => Invalid                

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Follow-up Comment #1:

Scheme's concept of "top-level environment" is a weird beast, and doesn't
really mix well with the R6RS/R7RS idea of modules/libraries.  If you don't
use -f, then the file is an "implicit module", and the define is lexical. It
doesn't automatically get put in the dynamic environment.  It may get added to
the dynamic environment when the module is required/imported, as part of the
magic to deal with the REPL.
Read the "Modules and how they are compiled to classes" for lots more detail
than you probably want.

In general, try avoid using environment-bound?, the dynamic environment, eval,
or load (as opposed to import or require).  If you do, the code will be
cleaner, faster and the compiler can catch errors more easily.  Of course
those features have their uses, but people thend to way overuse them.

If you really need to define a variable in the dynamic environment, use
define-variable instead of plain define.  Note that define-variable has
limited use, but can be suitable for dynamic binding and fluid-let.

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