SB-C:LVAR-VALUE used on non-constant LVAR #<SB-C::LVAR 1 {1008D8BAE3}>

[Paul F. Dietz]

(lambda (b c)
  (block b1
    (case
        (let (*)
          (if (eql c 0)
              (return-from b1 523191)
              b))
      (t (case c ((197 97 399) b) (t 0))))))

==>

SB-C:LVAR-VALUE used on non-constant LVAR #<SB-C::LVAR 1 {100865E163}>
   [Condition of type SIMPLE-ERROR]

Restarts:
 0: [RETRY] Retry SLIME REPL evaluation request.
 1: [*ABORT] Return to SLIME's top level.
 2: [ABORT] abort thread (#<THREAD tid=1923 "repl-thread" RUNNING {1008304563}>)

Backtrace:
  0: (SB-C:LVAR-VALUE #<SB-C::LVAR 1 {100865E163}>)
  1: ((LAMBDA (SB-C::CLEANUP) :IN SB-C::EMIT-CLEANUPS) #<SB-C::CLEANUP :KIND :SPECIAL-BIND :MESS-UP #<SB-C::COMBINATION :FUN NIL :ARGS (NIL NIL) {100865E083}> {100865DEB3}>)
  2: (SB-C::MAP-NESTED-CLEANUPS #<FUNCTION (LAMBDA (SB-C::CLEANUP) :IN SB-C::EMIT-CLEANUPS) {10086B7E8B}> #<SB-C::CBLOCK 5 :START c2 {1008661BC3}> NIL)
  3: (SB-C::EMIT-CLEANUPS (#<SB-C::CBLOCK 5 :START c2 {1008661BC3}>) #<SB-C::CBLOCK 3 :START c3 {1008658D63}>)
  4: (SB-C::FIND-CLEANUP-POINTS #<SB-C:COMPONENT :NAME "<unknown>" {1008660683}>)
  5: (SB-C::ENVIRONMENT-ANALYZE #<SB-C:COMPONENT :NAME "<unknown>" {1008660683}>)
  6: (SB-C::COMPILE-COMPONENT #<SB-C:COMPONENT :NAME "<unknown>" {1008660683}>)
  7: (SB-C::%COMPILE (LAMBDA (B C) (BLOCK B1 (CASE # #))) NIL NIL)
[...]

x86-64, "2.4.3.191-2c354b9d6"