[Chicken-hackers] [PATCH] Add unexport form for modules (updated for chicken 5)

[megane]

Hi,

here's an updated version of the unexport patch for chicken 5.

There were a couple of changes related to renamed identifiers and the
new 'library' slot for the module record.

Tested with the 5.0.0pre1 tarball.

Here's the copy-pasted description from the previous patch:

The implementation is pretty straightforward. A new slot, called
module-unexport-list, is added to the module record. Unexport adds
identifiers to this list if the module export list is *. In
##sys#finalize-module all identifiers about to be added to syntax-exports or
variable-exports are dropped if they are found in module-unexport-list.
Export form also drops identifiers from the unexport list.

If the module export list is not *, module-unexport-list is not used. In
this case, it's enough to just remove the identifier to be unexported
from the module-export-list.

module-unexport-syntax-for-5.patch
Description: patch