TEST-COALTON-LANG failing on Windows

[Jason94]

On Windows SBCL 2.4.11, main commit 548c63b, the TEST-COALTON-LANG test is failing when running (asdf:test-system "coalton").

  TEST-COALTON-LANG
; compiling file "C:/Users/JASON-~1/AppData/Local/Temp/tmpZCJK45JG-tmp.lisp" (written 31 DEC 2024 09:41:30 AM):
;
; caught ERROR:
;   READ error during COMPILE-FILE:
;
;     There are 54 elements in the :INITIAL-CONTENTS, but the vector length is 58.
;
;     (in form starting at line: 5, column: 0, position: 169)

; compilation aborted after 0:00:00.018

debugger invoked on a FIASCO::FAILED-ASSERTION in thread
#<THREAD tid=28824 "main thread" RUNNING {1100BC8093}>:
  Test assertion failed when running TEST-COALTON-LANG:

Strings differ at offset 0 of error text.
input file: C:/Users/jason-local/Documents/programming/workspace/coalton/tests/test-files/define-class.txt
line number: 1
test number: 1
test header: 1 Define class, single var

Define a class with a single type variable and no methods.

Rerun single test case with:
(coalton-tests:run-test "tests/test-files/define-class.txt" 1)

unexpected error:

The value
  NIL
is not of type
  (OR STRING PATHNAME STREAM)
when binding SB-FASL::FILESPEC

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [CONTINUE                             ] Roger, go on testing...
...

(FIASCO::RECORD-FAILURE FIASCO::FAILED-ASSERTION :FORM (IS (= (LENGTH A) (LENGTH . #1=(B))) (FORMAT NIL "Strings differ at offset ~A of ~A:~%~A~%~A" COMPARE-LEN CONTEXT A . #1#)) :FORMAT-CONTROL #<(SIMPLE-BASE-STRING 486) Strings differ at offset 0 of error text.
input file: C:/Users/jason-local/Documents/programming/workspace/coalton/tests/test-files/define-class.txt
line number: 1
test number: 1
test header: 1 Define... {110460DE7F}> :FORMAT-ARGUMENTS NIL)
   source: (ERROR FAILURE)