Missing slot error when clearing caches from CLOS browser

[pamoroso]

Describe the bug

In the CLOS browser, executing the command Recompute > Clear caches of the title bar left-click menu brings up a break window with the following error:

In CLOS::|(METHOD SLOT-MISSING (T T T T))|:
When attempting to set the slot's value to NIL (setf of slot-value),
the slot NOBIND is missing from the object #<CLOS-BROWSER::CLOS-BROWSER-NODE 122,62750>

To Reproduce

Steps to reproduce the behavior:

1. launch Medley
2. from the background menu, open the CLOS browser
3. when the CLOS browser prompts for a class, enter CL:STANDARD-OBJECT
4. from the title bar left click-menu of the CLOS browser, select Recompute > Clear caches

Expected behavior

The command is carried out with no error.

Screenshots

The break window:

The full desktop:

Context (please complete the following information):

• OS: Linux Mint Cinnamon
• OS Version: 22
• Host arch: x86_64 (System76 Merkaat)
• Maiko version: N/A
• IL:MAKESYSDATE: 25-Nov-2024 04:27:51

Additional context

The context of the error:

MOUSE/5(debug)BTV
CLOS::|(METHOD SLOT-MISSING (T T T T))|
CL:APPLY
   CLOS::*INVALID-DFUNS-ON-STACK* (#<Standard-Generic-Function CLOS:SLOT-MISSING (1) 131,72434> #<Standard-Generic-Function CLOS-BROWSER::CLEAR-METHOD-MENU-CACHES (1) 125,145574> #<Standard-Generic-Function WEB::TITLE-SELECTION (1) 125,145030> #<Standard-Generic-Function WEB::BUTTON-EVENT-FN (1) 124,77340>)
CLOS::INITIAL-DFUN
"lambda in MAKE-INITIAL-DFUN"
CLOS::SET-SLOT-VALUE
CLOS::|(METHOD CLOS-BROWSER::CLEAR-METHOD-MENU-CACHES (CLOS-BROWSER:CLOS-BROWSER))|
CL:APPLY
CLOS::INITIAL-DFUN
"lambda in MAKE-INITIAL-DFUN"
CL:APPLY
   CLOS::*INVALID-DFUNS-ON-STACK* (#<Standard-Generic-Function CLOS-BROWSER::CLEAR-METHOD-MENU-CACHES (1) 125,145574> #<Standard-Generic-Function WEB::TITLE-SELECTION (1) 125,145030> #<Standard-Generic-Function WEB::BUTTON-EVENT-FN (1) 124,77340>)
CLOS::INVALID-DFUN
"lambda in INVALIDATE-DFUN-INTERNAL"
CLOS::|(METHOD WEB::TITLE-SELECTION (WEB:WEB-EDITOR))|
CL:APPLY
   CLOS::*INVALID-DFUNS-ON-STACK* (#<Standard-Generic-Function WEB::TITLE-SELECTION (1) 125,145030> #<Standard-Generic-Function WEB::BUTTON-EVENT-FN (1) 124,77340>)
CLOS::INITIAL-DFUN
"lambda in MAKE-INITIAL-DFUN"
   SI::*CATCH-RETURN-TO* (& &)
   *PROCEED-CASES* (& &)
   SI::*NLSETQFLAG* NIL
   SI::*CATCH-RETURN-PC* 666
CLOS::|(METHOD WEB::BUTTON-EVENT-FN (WEB:WEB-EDITOR))|
CL:APPLY
   CLOS::*INVALID-DFUNS-ON-STACK* (#<Standard-Generic-Function WEB::BUTTON-EVENT-FN (1) 124,77340>)
CLOS::INITIAL-DFUN
"lambda in MAKE-INITIAL-DFUN"
   WEB::WINDOW-FOR-MENU #<CLOS-BROWSER:CLOS-BROWSER 124,67030>
WEB::WEB-WINDOW-BUTTON-EVENT-FN
   SI::*DUMMY-FOR-CATCH* T
   SI::*CATCH-RETURN-FROM* (&)
\PROTECTED.APPLYA0001
   FN WEB::WEB-WINDOW-BUTTON-EVENT-FN
   WINDOW {WINDOW}#122,63664
   SI::NLSETQ-VALUE NIL
   *PROCEED-CASES* (&)
   SI::*NLSETQFLAG* NIL
\PROTECTED.APPLY
   \MHCOM WEB::WEB-WINDOW-BUTTON-EVENT-FN
   \MHPROCESS NIL
   \MHWINDOW {WINDOW}#122,63664
   \MOUSEBUSY T
WINDOW.MOUSE.HANDLER
   \OLDTTY #<Process EXEC/174,24204>
   \MOUSEBUSY NIL
\MOUSE.PROCESS
   *FORM* (\MOUSE.PROCESS)
   *ARGVAL* NIL
   *TAIL* NIL
   *FN* \MOUSE.PROCESS
\EVALFORM
   %#FORM# (\MOUSE.PROCESS)
   *CURRENT-PROCESS* #<Process OLDMOUSE/174,24410>
   HELPFLAG BREAK!
   \CURRENTDISPLAYLINE 0
   \#DISPLAYLINES 15
   \LINEBUF.OFD #<IO Linebuffer Stream/173,157100>
   *READTABLE* #<ReadTable INTERLISP/174,73714>
   \PRIMTERMTABLE {TERMTABLEP}#174,66740
   \PRIMTERMSA {CHARTABLE}#174,67000
   TtyDisplayStream #<Output Display Stream/130,24500>
   SI::*RESETFORMS* NIL
   \INTERRUPTABLE T
   \TTYWINDOW {WINDOW}#122,63474
   READBUF NIL
   \TERM.OFD #<Output Display Stream/130,4100>
   *STANDARD-OUTPUT* #<Output Display Stream/130,4100>
   *STANDARD-INPUT* #<IO Linebuffer Stream/173,157100>
\MAKE.PROCESS0
T