https://github.com/cbaggers/disposable.git
git clone 'https://github.com/cbaggers/disposable.git'
(ql:quickload :disposable)
Dispose and with-disposable appear in many projects. May as well make a common package.
The generic dispose method is provided so people can specify how to dispose their own types.
The with-disposable macro wraps a progn in unwind-protect to ensure dispose is called on the target object at the end of the scope.