On Fri, 27 May 2011, Shiro Kawai wrote:

> So, even for REPL implementations, phase separation is a concern.

Yes, and if the REPL enforces phase separation properly, your programs
will have the nice invariance of continuing to work (in most instances) even
once you compile it.

If not, you run into the classic problem of programs tested in the REPL
running fine and then blowing up mysteriously once compiled because of phase
problems.

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