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Helmut Eller authored
* swank-backend.lisp (background-save-image): New. * swank-sbcl.lisp (command-line-args, dup, sys-execv, exec-image) (make-fd-stream, background-save-image): New. Add support to save snapshots in backround. * swank-snapshot.lisp (background-save-snapshot): New. (resurrect): Initialize repl streams. * slime-snapshot.el (slime-snapshot): With prefix-arg perform saving in background. Also ask before overwriting existing files.
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