[Sbcl-help] method names for already existing functions

[Martin E. <ma...@11...>]

Greetings,

Sometimes I forget not to call accessor methods FORMAT, TYPE etc.

 > (defclass foo ()
	((format :accessor format)))
Error: "FORMAT already names an ordinary function or a macro.".
 > (defclass foo ()
	((file-format :accessor file-format)))
Error: "FORMAT already names an ordinary function or a macro.".

I expected my redefinition to work, but apparently it doesn't. Is this
a bug, or just a case of "Don't do that then"?

Also, on a similar note,

 > (defclass bar ()
	((type :accessor type)))
debugger invoked on a SYMBOL-PACKAGE-LOCKED-ERROR in thread 20039:
   Lock on package COMMON-LISP violated when setting fdefinition of TYPE.
   [....]
restarts (invokable by number or by possibly-abbreviated name):
   0: [CONTINUE      ] Ignore the package lock.
   1: [IGNORE-ALL    ] Ignore all package locks in the context of this 
operation.
   2: [UNLOCK-PACKAGE] Unlock the package.
   3: [ABORT         ] Reduce debugger level (leaving debugger, returning to
                       toplevel).
   4: [TOPLEVEL      ] Restart at toplevel READ/EVAL/PRINT loop.
 >:ABORT
 > (defclass bar ()
	((file-type :accessor file-type)))
Lock on package COMMON-LISP violated when setting fdefinition of TYPE.

Here I choose the :ABORT restart on the package-lock error, but I can
still can't redefine my BAR-class.

Is there a reason for the first type of mistake (with FORMAT) giving one 
sort of error, but the other (with TYPE) giving another?

I'm using SBCL 0.8.19 with slime on RH9/x86.

Cheers.

Martin