Current CVS HEAD SBCL breaks Slime again. I cheerfully submit that this is "not SBCL's fault" as the interfaces that have changed were unexported and unsupported:
1) SB-DEBUG::PRINT-CODE-LOCATION-SOURCE-FORM was replaced by SB-DEBUG::CODE-LOCATION-SOURCE-FORM; do the printing as you please.
2) SB-DEBUG::PRINT-FRAME-CALL now takes a second required argument, the stream to print to.
The attached patch should fixes things for both bleeding edge and older versions, but still uses the unexported interfaces and is hence liable to break again. :/
Cheers,
-- Nikodemus Schemer: "Buddha is small, clean, and serious." Lispnik: "Buddha is big, has hairy armpits, and laughs."