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You can see a description of the problem and a solution at: ​http://common-lisp.net/pipermail/asdf-devel/2010-October/001708.html

A trace is shown at: ​http://paste.lisp.org/+2H95 [This paste will automatically go away in 6 days.]

In a nutshell, ASDF2 will unintern portions of itself if ASDF is already loaded and it is loaded again during the build process.

The solution is to start ccl with the --no-init option before invoking (ccl:rebuild-ccl :full t) so that any "(require :asdf)" form in .ccl-init is bypassed.

I don't think any code changes need be done to ccl, but it would be nice if something would be mentioned in the ccl documentation, otherwise this conflict between asdf and ccl is going to show up again.

Perhaps section "3.3 Building Everything" of the Clozure CL Documentation would be a good place to document this issue.

installed 1.6 via svn this am. Tried to load a system via asdf. asdf:find-system undefined. This happens with either the system asdf loaded via require or with the asdf included with quicklisp.

Not sure if this is a ccl or asdf problem, but everything works fine in ccl-1.5 so I suspect something in 1.6.

In ccl 1.6 (32-bit), we get

1> (atan #c(-1d-20 2d0))
#C(-1.5707963267948966D0 0.5493061443340549D0)

This is right, I think. However,

2> (atan #c(-0d0 2d0))
#C(1.5707963267948966D0 0.5493061443340549D0)

The spec says that on the imaginary axis above i, atan is continuous on Quadrant II. Since float-sign -0d0) -> -1d0, both answers should have the same sign for the realpart.