While evaluating the form starting at line 36, column 0 of #P"/home/user/quicklisp/local-projects/MBuild/Mezzano/../build-cold-image.lisp": debugger invoked on a SIMPLE-ERROR in thread #<THREAD "main thread" RUNNING {1000510083}>: The assertion (MEZZANO.LAP.ARM64::SHIFTED-MASK-P MEZZANO.LAP.ARM64::IMM) failed with MEZZANO.LAP.ARM64::IMM = 220. Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL. restarts (invokable by number or by possibly-abbreviated name): 0: [CONTINUE] Retry assertion. 1: [RETRY ] Retry EVAL of current toplevel form. 2: Ignore error and continue loading file "/home/user/quicklisp/local-projects/MBuild/Mezzano/../build-cold-image.lisp". 3: [ABORT ] Abort loading file "/home/user/quicklisp/local-projects/MBuild/Mezzano/../build-cold-image.lisp". 4: Ignore runtime option --load "../build-cold-image.lisp". 5: Skip rest of --eval and --load options. 6: Skip to toplevel READ/EVAL/PRINT loop. 7: [EXIT ] Exit SBCL (calling #'EXIT, killing the process). (SB-KERNEL:ASSERT-ERROR (MEZZANO.LAP.ARM64::SHIFTED-MASK-P MEZZANO.LAP.ARM64::IMM) 1 MEZZANO.LAP.ARM64::IMM 220)