-(defconstant +fasl-file-version+ 27)
-;;; (record of versions before 0.7.0 deleted in 0.7.1.41)
-;;; 23 = sbcl-0.7.0.1 deleted no-longer-used EVAL-STACK stuff,
-;;; causing changes in *STATIC-SYMBOLS*.
-;;; 24 = sbcl-0.7.1.19 changed PCL service routines which might be
-;;; called from macroexpanded code
-;;; 25 = sbcl-0.7.1.41 (and immediately preceding versions, actually)
-;;; introduced new functions to check for control stack exhaustion
-;;; 26 = sbcl-0.7.2.4 or so added :VARIABLE :MACRO-EXPANSION to INFO codes
-;;; 27 (2002-04-08) added MIGHT-CONTAIN-OTHER-TYPES? slot to CTYPE
+(def!constant +fasl-file-version+ 77)
+;;; (description of versions before 0.9.0.1 deleted in 0.9.17)
+;;; 56: (2005-05-22) Something between 0.9.0.1 and 0.9.0.14. My money is
+;;; on 0.9.0.6 (MORE CASE CONSISTENCY).
+;;; 57: (2005-06-12) Raw slot rearrangement in 0.9.1.38
+;;; 58: (2005-08-16) Multiple incompatible changes between 0.9.3 and 0.9.3.60
+;;; 59: (2005-09-18) METAOBJECT implementation, removal of INSTANCE and
+;;; FUNCALLABLE-INSTANCE classes.
+;;; 60: (2005-10-24) Bumped for 0.9.6
+;;; 61: (2005-11-06) Improved source location recording added extra parameters
+;;; to multiple %DEFMUMBLE functions.
+;;; 62: (2005-12-30) Make the count of FASL header counted strings
+;;; a 32-bit value also on 64-bit platforms.
+;;; 63: (2006-01-27) Shuffle storage classes around to reduce the error
+;;; trap information size on RISCy platforms.
+;;; 64: (2006-03-24) New calling convention for unknown-values on x86 and
+;;; x86-64. Also (belatedly) PPC/gencgc, including :gencgc on FPAFF.
+;;; 65: (2006-04-11) Package locking interface changed.
+;;; 66: (2006-05-13) Fopcompiler
+;;; 67: (2006-07-25) Reports on #lisp about 0.9.13 fasls being invalid on
+;;; 0.9.14.something
+;;; 68: (2006-08-14) changed number of arguments of LOAD-DEFMETHOD
+;;; 69: (2006-08-17) changed validity of various initargs for methods
+;;; 70: (2006-09-13) changes to *PSEUDO-ATOMIC* on x86 and x86-64
+;;; 71: (2006-11-19) CLOS calling convention changes
+;;; 72: (2006-12-05) Added slot to the primitive function type
+;;; 73: (2007-04-13) Changed a hash function
+;;; 74: (2007-06-05) UNWIND-TO-FRAME-AND-CALL
+;;; 75: (2007-08-06) FD-STREAM layout changes
+;;; 76: (2007-10-05) MUTEX layout changes
+;;; 77: (2007-11-08) Essentially obsolete fasl-file-version, fasls are now
+;;; considered compatible only when the version numbers of the compiling
+;;; SBCL instance is exactly the same as the one of the loading instance.
+;;; Further fasl-file-version bumps should only be done for real changes
+;;; in the fasl format, not for changes in function/macro signatures or
+;;; lisp data structures.