The assertion
(MEZZANO.LAP.ARM64::SHIFTED-MASK-P MEZZANO.LAP.ARM64::IMM)
failed with MEZZANO.LAP.ARM64::IMM = 220.
   [Condition of type SIMPLE-ERROR]

Restarts:
 0: [CONTINUE] Retry assertion.
 1: [RETRY] Retry EVAL of current toplevel form.
 2: [CONTINUE] Ignore error and continue loading file "/home/user/usr/src/MBuild/build-cold-image.lisp".
 3: [ABORT] Abort loading file "/home/user/usr/src/MBuild/build-cold-image.lisp".
 4: [RETRY] Retry SLIME REPL evaluation request.
 5: [*ABORT] Return to SLIME's top level.
 --more--

Backtrace:
  0: (SB-KERNEL:ASSERT-ERROR (MEZZANO.LAP.ARM64::SHIFTED-MASK-P MEZZANO.LAP.ARM64::IMM) 1 MEZZANO.LAP.ARM64::IMM 220)
  1: (MEZZANO.LAP.ARM64::ENCODE-BIT-MASK 220 64)
  2: (MEZZANO.LAP.ARM64::EMIT-LOGICAL-INSTRUCTION 0 NIL :X5 :X5 220 NIL NIL)
  3: (MEZZANO.LAP.ARM64::AND-ASSEMBLER (AND :X5 :X5 220))
  4: (MEZZANO.LAP::PERFORM-ASSEMBLY-PASS1 #<HASH-TABLE :TEST EQL :COUNT 105 {1002311F13}> (MEZZANO.COMPILER.BACKEND.ARM64::ENTRY-POINT (:DEBUG NIL) (:GC :NO-FRAME :INCOMING-ARGUMENTS :RCX :LAYOUT #*) (MEZZ..
  5: (MEZZANO.LAP:PERFORM-ASSEMBLY #<HASH-TABLE :TEST EQL :COUNT 105 {1002311F13}> (MEZZANO.COMPILER.BACKEND.ARM64::ENTRY-POINT (:DEBUG NIL) (:GC :NO-FRAME :INCOMING-ARGUMENTS :RCX :LAYOUT #*) (MEZZANO.LAP..
  6: (MEZZANO.INTERNALS::ASSEMBLE-LAP (MEZZANO.COMPILER.BACKEND.ARM64::ENTRY-POINT (:DEBUG NIL) (:GC :NO-FRAME :INCOMING-ARGUMENTS :RCX :LAYOUT #*) (MEZZANO.LAP.ARM64:STP :X29 :X30 (:PRE :SP -16)) (:GC :NO..
  7: (MEZZANO.COMPILER::COMPILE-LAMBDA (LAMBDA #1=(MEZZANO.COMPILER.BACKEND.ARM64::OBJECT) (DECLARE (MEZZANO.INTERNALS::LAMBDA-NAME MEZZANO.INTERNALS::%INSTANCE-OR-FUNCALLABLE-INSTANCE-P)) (FUNCALL (FUNCTI..
  8: (MEZZANO.COMPILER::X-COMPILE-FOR-VALUE (LAMBDA #1=(MEZZANO.COMPILER.BACKEND.ARM64::OBJECT) (DECLARE (MEZZANO.INTERNALS::LAMBDA-NAME MEZZANO.INTERNALS::%INSTANCE-OR-FUNCALLABLE-INSTANCE-P)) (FUNCALL (F..
  9: (MEZZANO.COMPILER::X-COMPILE-FOR-VALUE (MEZZANO.INTERNALS::%DEFUN (QUOTE MEZZANO.INTERNALS::%INSTANCE-OR-FUNCALLABLE-INSTANCE-P) (LAMBDA #1=(MEZZANO.COMPILER.BACKEND.ARM64::OBJECT) (DECLARE #) (FUNCAL..
 10: (MEZZANO.COMPILER::X-COMPILE (MEZZANO.INTERNALS::%DEFUN (QUOTE MEZZANO.INTERNALS::%INSTANCE-OR-FUNCALLABLE-INSTANCE-P) (LAMBDA #1=(MEZZANO.COMPILER.BACKEND.ARM64::OBJECT) (DECLARE #) (FUNCALL # . #1#)..
 11: (MEZZANO.COMPILER::SAVE-CUSTOM-COMPILED-FILE #P"/home/user/usr/src/MBuild/Mezzano/build-arm64/%%compiler-builtins.llf" #<CLOSURE (LAMBDA NIL :IN MEZZANO.COMPILER::SAVE-COMPILER-BUILTINS) {10088C835B}>..
 12: (MEZZANO.COMPILER::SAVE-COMPILER-BUILTINS #P"/home/user/usr/src/MBuild/Mezzano/build-arm64/%%compiler-builtins.llf" :ARM64)
 13: (MEZZANO.COLD-GENERATOR::LOAD-COMPILER-BUILTINS #<MEZZANO.COLD-GENERATOR.ENVIRONMENT:ENVIRONMENT {10087C1913}>)
 14: (MEZZANO.COLD-GENERATOR::SAVE-COLD-FILES #<MEZZANO.COLD-GENERATOR.ENVIRONMENT:ENVIRONMENT {10087C1913}>)
 15: (MEZZANO.COLD-GENERATOR::CONFIGURE-SYSTEM #<MEZZANO.COLD-GENERATOR.ENVIRONMENT:ENVIRONMENT {10087C1913}>)
 16: (MEZZANO.COLD-GENERATOR:MAKE-IMAGE "../../mezzano" :HEADER-PATH "tools/disk-header.bin" :IMAGE-SIZE 5368709120 :MAP-FILE NIL :ARCHITECTURE :ARM64 :UUID NIL)
 17: (SB-INT:SIMPLE-EVAL-IN-LEXENV (MEZZANO.COLD-GENERATOR:MAKE-IMAGE "../../mezzano" :ARCHITECTURE :ARM64 :IMAGE-SIZE (* 5 1024 1024 1024) ...) #<NULL-LEXENV>)
 18: (EVAL-TLF (MEZZANO.COLD-GENERATOR:MAKE-IMAGE "../../mezzano" :ARCHITECTURE :ARM64 :IMAGE-SIZE (* 5 1024 1024 1024) ...) 8 NIL)
 19: ((LABELS SB-FASL::EVAL-FORM :IN SB-INT:LOAD-AS-SOURCE) (MEZZANO.COLD-GENERATOR:MAKE-IMAGE "../../mezzano" :ARCHITECTURE :ARM64 :IMAGE-SIZE (* 5 1024 1024 1024) ...) 8)
 --more--