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EVAL-WHEN buried inside forms.
Please keep in mind that this message assumes I understand how EVAL-WHEN
is supposed to work, which I might not.
I don't believe that the model for EVAL-WHEN takes into account uses at
other than "top level". For example:
(eval-when (compile load)
The LET will be EVALed at compile-time by virtue of the compile
situation in the outer EVAL-WHEN. Then, as the compiler begins to
process the body of the LET, it will see the inner EVAL-WHEN and EVAL
the stuff, then discard it. Oops, the stuff was EVALed twice!
In order to deal with EVAL-WHEN forms anywhere, we need to improve the
model. But it's not clear to me what some combinations mean.