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A simple session in the REPL now:
> # Empty line, or only a comment, outputs "Nil", before was nothing
Nil
> Nil # outputs "Nil", before was nothing
Nil
> "" # No output, before was a blank line
> "hello"
hello
> 0
0
> False
False
This isn't quite consistent with what the REPL did before the recent changes. I
think at the very least the empty-string input should print out a newline.
Should whitespace-only/comment input result in "Nil\n"? I think no.
Should Nil input/output result in "Nil\n"? I think YES (which is different than
before). But it might be difficult to distinguish from empty input -- though we
could at least special-case literally "\n" input.
I imagine we could also have perl-mode instead of gist-mode, so that the output
is proper and evaluable perl. Probably an internal setting, or something I do
in a 3rd party REPL.
(I will do this work myself, but want suggestions)
