Hello SLIME developers,
New variant of slime-snapshot proposed update (for SBCL+unix) is attached. Implementation dependencies were moved where they belong, i.e. into SBCL backend.
This new variant includes a new interface, with SBCL+unix implementation, namely, background-save-image: while the image is dumped, the main REPL remains available; success or failure is reported with a background message. Slime-snapshot is patched to use background-save-image in the presence of prefix argument: C-u M-x slime-snapshot <RET>. Without a prefix argument, it uses normal, synchronous (save-image).