changes in sbcl-2.0.1 relative to sbcl-2.0.0:

  * minor incompatible change: some symbols have been removed from *FEATURES*
    based on a determination of which should be impermissible to examine
    via #+ and #- reader macros in user-written code.
  * optimization: DEFSTRUCT copiers including COPY-STRUCTURE are able to
    stack-allocate the result when declared dynamic-extent.
  * bug fix: loop analysis code more robust. In particular, loop nesting depth
    is computed more accurately, improving the register allocation around
    loops.
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