memory fault loading .fasl or type-error during compilation

[3b]

on windows and linux x8664, 2.3.0.130-2ae8a38b6 (seems to be new since 2.3.0?)

loading a fasl of a file containing

((lambda ()
   (alexandria:format-symbol :keyword "~a" 2)
   (alexandria:format-symbol :keyword "~a" 2)))

errors with

CORRUPTION WARNING in SBCL pid 27928 tid 27928:
Memory fault at 0xfffffffffffffff9 (pc=0x536082b6 [code 0x53608230+0x86 ID 0x6b92], fp=0x7f8ba3767528, sp=0x7f8ba3767518) tid 27928
The integrity of this image is possibly compromised.
Continuing with fingers crossed.

debugger invoked on a SB-SYS:MEMORY-FAULT-ERROR in thread #<THREAD "main thread" RUNNING {10013A0003}>: Unhandled memory fault at #xFFFFFFFFFFFFFFF9.

with (sb-ext:restrict-compiler-policy 'debug 3 3), it instead fails during compilation with

debugger invoked on a TYPE-ERROR @52DA4948 in thread
#<THREAD "main thread" RUNNING {10013A0003}>:
  The value
    0
  is not of type
    SB-C::CONSTRAINT

Seems to be specific to top-level forms (original code was building the initial value for a defparameter).

[Stas Boukarev (stassats)]

Bisected to https://github.com/sbcl/sbcl/commit/9a5325b3cd7855b00fe9500401d5c2c41639575e