Re: eval-when bug

[Stephen L Nicoud <snicoud@atc.boeing.com>]

    Date: 3 Jan 91 21:00:05 GMT
    From: harrisr@turing.cs.rpi.edu (Richard Harris)

    This bug appears in KCL and every version of AKCL, and is not really
    related to EVAL-WHEN.  It is caused by the way the KCL compiler
    arranges to do the load-time package operations and interning of
    symbols that are required by the file being compiled.  At load-time,
    the package operations that were at top level in the source file are
    run, and all the file's symbols are interned, BEFORE anything else is
    done.  In your example, LOAD attempts to intern foobar in the package
    abc, before running the (unless ...) form.  The make-package is not
    done first because it does not appear at top level.

    This is a fairly difficult bug to fix.

    You can work around the bug, though, by (1) splitting files, or (2)
    using package operations at top level wherever possible.  In you
    example, you could (1) put the (unless ...) form in a separate file, or
    (2) replace the (unless ...) form with (in-package 'abc)(in-package
    'user).

    Richard Harris

or maybe (3) replace 'abc::foobar with (intern "FOOBAR" :abc).

Stephen
--
Stephen L Nicoud  <snicoud@atc.boeing.com>  uw-beaver!bcsaic!snicoud
Boeing Advanced Technology Center for Computer Sciences
Bellevue, Washington USA