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Features that don't adhere to AMOP in various CLOS MOP implementations, and whether and how they are resolved in Closer to MOP.

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Allegro Common Lisp 8.2 & 9.0
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- CLASS-DIRECT-DEFAULT-INITARGS and CLASS-DEFAULT-INITARGS don't return canonicalized default initargs as specified. Not fixed.
- FUNCALLABLE-STANDARD-OBJECT is not used as the default superclass for classes with :metaclass FUNCALLABLE-STANDARD-CLASS.
- DEFGENERIC does not call FIND-METHOD-COMBINATION. Not fixed.
- DEFMETHOD doesn't call MAKE-METHOD-LAMBDA. Fixed.
- The dependent protocol for generic functions doesn't work fully. Fixed.
- GENERIC-FUNCTION-ARGUMENT-PRECEDENCE-ORDER doesn't return only the required arguments. Fixed.
- The function invocation protocol doesn't call COMPUTE-APPLICABLE-METHODS, COMPUTE-APPLICABLE-METHODS-USING-CLASSES and COMPUTE-EFFECTIVE-METHOD. Fixed.
- The :ALLOCATION type cannot be extended. Fixed.
- MAKE-METHOD-LAMBDA is not provided. Fixed.
- Method functions don't take parameters as specified in AMOP, but instead just the parameters that the generic function receives. Fixed.
- REINITIALIZE-INSTANCE doesn't determine a new discriminating function. Fixed.
- (SETF CLASS-NAME) and (SETF GENERIC-FUNCTION-NAME) do not use REINITIALIZE-INSTANCE for changing the names. Not fixed.
- SLOT-MAKUNBOUND-USING-CLASS is not specialized on slot definition metaobjects, but on symbols. Fixed.
- STANDARD-CLASS and FUNCALLABLE-STANDARD-CLASS are not compatible. Not fixed.
- VALIDATE-SUPERCLASS doesn't recognize T as a valid superclass. Not fixed.
- Subclasses of BUILT-IN-CLASS, FORWARD-REFERENCED-CLASS, FUNCALLABLE-STANDARD-CLASS, METHOD-COMBINATION, STANDARD-ACCESSOR-METHOD, STANDARD-CLASS, STANDARD-DIRECT-SLOT-DEFINITION, STANDARD-EFFECTIVE-SLOT-DEFINITION, STANDARD-GENERIC-FUNCTION, STANDARD-METHOD, STANDARD-READER-METHOD, STANDARD-SLOT-DEFINITION and STANDARD-WRITER-METHOD will inherit slots whose names are exported symbols and/or accessible in the package common-lisp-user. Not fixed.

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CLisp 2.49
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- Methods are not initialized with :function. Not fixed.
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- ADD-METHOD, REMOVE-METHOD, INITIALIZE-INSTANCE and REINITIALIZE-INSTANCE do not determine a new discriminating function. This is postponed until function invocation instead, so shouldn't be a problem in practice.
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- The slot order requested by a primary method for COMPUTE-SLOTS is not honoured by this MOP. Not fixed.
- DEFMETHOD does not call MAKE-METHOD-LAMBDA. Fixed.
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- A FORWARD-REFERENCED-CLASS is not changed via CHANGE-CLASS (but is correctly reinitialized via REINITIALIZE-INSTANCE).
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- MAKE-METHOD-LAMBDA is not provided. Fixed.
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- Subclasses of METHOD-COMBINATION will inherit slots whose names are exported symbols and/or accessible in the package common-lisp-user. Not fixed.
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Clozure Common Lisp 1.8
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- ADD-METHOD, REMOVE-METHOD, INITIALIZE-INSTANCE and REINITIALIZE-INSTANCE don't call COMPUTE-DISCRIMINATING-FUNCTION. Fixed.
- DEFMETHOD doesn't call GENERIC-FUNCTION-METHOD-CLASS or MAKE-METHOD-LAMBDA. Fixed.
- Discriminating functions cannot be determined, and thus cannot be closures and cannot be funcalled. Fixed.
- Geveric function invocation doesn't call COMPUTE-APPLICABLE-METHODS, COMPUTE-APPLICABLE-METHODS-USING-CLASSES, or COMPUTE-EFFECTIVE-METHOD. Fixed.
- Generic functions cannot be empty when called. Fixed.
- MAKE-METHOD-LAMBDA is not supported. Fixed.
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- Reinitialization of a lambda list doesn't update the argument precedence order. Fixed.
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- The slot order requested by a primary method for COMPUTE-SLOTS is not honoured by this MOP. Not fixed.
- DOCUMENTATION doesn't return the documentation strings for slot definition metaobjects. Fixed.
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- REINITIALIZE-INSTANCE of a class metaobject doesn't invoke FINALIZE-INHERITANCE again. Fixed.
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- Subclasses of DIRECT-SLOT-DEFINITION, EFFECTIVE-SLOT-DEFINITION, GENERIC-FUNCTION, SLOT-DEFINITION, STANDARD-ACCESSOR-METHOD, STANDARD-DIRECT-SLOT-DEFINITION, STANDARD-EFFECTIVE-SLOT-DEFINITION, STANDARD-GENERIC-FUNCTION, STANDARD-METHOD, STANDARD-READER-METHOD, STANDARD-SLOT-DEFINITION and STANDARD-WRITER-METHOD will inherit slots whose names are exported symbols and/or accessible in the package common-lisp-user. Not fixed.

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CMUCL 20d
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- CLASS-DIRECT-DEFAULT-INITARGS and CLASS-DEFAULT-INITARGS don't return canonicalized default initargs as specified. Not fixed.
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- Accessor methods are not initialized with :function, :lambda-list, :slot-definition and :specializers. Fixed.
- Classes cannot be anonymous. Fixed.
- Class initialization doesn't call READER-METHOD-CLASS and WRITER-METHOD-CLASS for accessor methods. Fixed.
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- The object returned by compute-discriminating-function cannot be a closure. Likewise, the second parameter to set-funcallable-instance-function cannot be a closure, but only a "pure" function/thunk. Not fixed.
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- Effective slot definitions are not initialized with :documentation, and EFFECTIVE-SLOT-DEFINITION-CLASS also doesn't receive that initarg. Not fixed.
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- Calling DOCUMENTATION on effective slot definition metaobjects don't return their documentation as specified in ANSI Common Lisp. Fixed.
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- Methods are not initialized with :function. Not fixed.
- Multiple slot options are not passed as lists to DIRECT-SLOT-DEFINITION-CLASS. Not fixed, but use FIX-SLOT-INITARGS as a workaround.
- REINITIALIZE-INSTANCE doesn't determine a new discriminating function. Fixed.
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- REINITIALIZE-INSTANCE of a class metaobject doesn't invoke FINALIZE-INHERITANCE again. Not fixed.
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- (SETF CLASS-NAME) and (SETF GENERIC-FUNCTION-NAME) do not use REINITIALIZE-INSTANCE for changing the names. Fixed.
- STANDARD-CLASS and FUNCALLABLE-STANDARD-CLASS are not compatible. Not fixed.
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- Subclasses of BUILT-IN-CLASS, CLASS, DIRECT-SLOT-DEFINITION, EFFECTIVE-SLOT-DEFINITION, EQL-SPECIALIZER, FORWARD-REFERENCED-CLASS, FUNCALLABLE-STANDARD-CLASS, SLOT-DEFINITION, SPECIALIZER, STANDARD-ACCESSOR-METHOD, STANDARD-CLASS, STANDARD-DIRECT-SLOT-DEFINITION, STANDARD-EFFECTIVE-SLOT-DEFINITION, STANDARD-GENERIC-FUNCTION, STANDARD-METHOD, STANDARD-READER-METHOD, STANDARD-SLOT-DEFINITION and STANDARD-WRITER-METHOD will inherit slots whose names are exported symbols and/or accessible in the package common-lisp-user. Not fixed.
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Embeddable Common Lisp 12.12.1
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- Class initialization doesn't call READER-METHOD-CLASS and WRITER-METHOD-CLASS for accessor methods. However, ECL merely delays invocation of those two functions until a class is finalized, so this shouldn't be a problem in practice.
- Subclasses of BUILT-IN-CLASS, CLASS, DIRECT-SLOT-DEFINITION, EFFECTIVE-SLOT-DEFINITION, FORWARD-REFERENCED-CLASS, FUNCALLABLE-STANDARD-CLASS, SLOT-DEFINITION, STANDARD-ACCESSOR-METHOD, STANDARD-CLASS, STANDARD-DIRECT-SLOT-DEFINITION, STANDARD-EFFECTIVE-SLOT-DEFINITION, STANDARD-GENERIC-FUNCTION, STANDARD-METHOD, STANDARD-READER-METHOD, STANDARD-SLOT-DEFINITION, and STANDARD-WRITER-METHOD will inherit slots whose names are exported symbols and/or accessible in the package common-lisp-user. Not fixed.

LispWorks 5.1.2 Personal & Professional Edition
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- CLASS-DIRECT-DEFAULT-INITARGS and CLASS-DEFAULT-INITARGS don't return canonicalized default initargs as specified. Not fixed.
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- ADD-METHOD, REMOVE-METHOD, INITIALIZE-INSTANCE and REINITIALIZE-INSTANCE do not determine a new discriminating function. This is postponed until function invocation instead, so shouldn't be a problem in practice.
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- COMPUTE-APPLICABLE-METHODS-USING-CLASSES doesn't exist. Fixed.
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- COMPUTE-DEFAULT-INITARGS doesn't exist. Not fixed.
- DEFGENERIC does not call FIND-METHOD-COMBINATION. Not fixed.
- EQL-SPECIALIZER, EQL-SPECIALIZER-OBJECT and INTERN-EQL-SPECIALIZER don't exist. In LispWorks, eql specializers are lists not objects. I have provided EQL-SPECIALIZER as a type (not as a class) and EQL-SPECIALIZER-OBJECT and INTERN-EQL-SPECIALIZER to work on lists, and a class EQL-SPECIALIZER* and corresponding EQL-SPECIALIZER-OBJECT* and INTERN-EQL-SPECILAIZER* to soften the incompatibilities.
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- Before LispWorks 5.1, the :ALLOCATION type cannot be extended. Not fixed.
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- FIND-METHOD-COMBINATION doesn't exist. Fixed, but fixed version doesn't work with method combination options.
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- FUNCALLABLE-STANDARD-INSTANCE-ACCESS and STANDARD-INSTANCE-ACCESS don't exist. Fixed.
- The function invocation protocol doesn't call COMPUTE-APPLICABLE-METHODS and COMPUTE-APPLICABLE-METHODS-USING-CLASSES. Fixed.
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- MAKE-METHOD-LAMBDA expects other parameters than specified. Fixed.
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- Method functions don't take parameters as specified in AMOP, but instead just the parameters that the generic function receives. Fixed.
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- The slot methods (SLOT-VALUE-USING-CLASS, etc.) are not specialized on effective slot definitions, but on slot names. Fixed.
- The generated accessor methods don't use the slot methods for accessing slots. Fixed. (Don't use :optimize-slot-access to deoptimize slot access, or otherwise the fixed slot access protocol doesn't work anymore!)
- SPECIALIZER doesn't exist. Not fixed.
- SPECIALIZER-DIRECT-GENERIC-FUNCTIONS doesn't exist. Fixed.
- STANDARD-CLASS and FUNCALLABLE-STANDARD-CLASS are not compatible. Not fixed.
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- Subclasses of BUILT-IN-CLASS (fixed), CLASS (fixed), DIRECT-SLOT-DEFINITION, EFFECTIVE-SLOT-DEFINITION, FORWARD-REFERENCED-CLASS (fixed), FUNCALLABLE-STANDARD-CLASS (fixed), SLOT-DEFINITION, STANDARD-ACCESSOR-METHOD, STANDARD-CLASS (fixed), STANDARD-DIRECT-SLOT-DEFINITION, STANDARD-EFFECTIVE-SLOT-DEFINITION, STANDARD-GENERIC-FUNCTION, STANDARD-METHOD, STANDARD-READER-METHOD, STANDARD-SLOT-DEFINITION and STANDARD-WRITER-METHOD will inherit slots whose names are exported symbols and/or accessible in the package common-lisp-user. Not fixed, except where indicated otherwise.
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LispWorks 6.0.1 Enterprise Edition & 6.1 Professional Edition
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- CLASS-DIRECT-DEFAULT-INITARGS and CLASS-DEFAULT-INITARGS don't return canonicalized default initargs as specified. Not fixed.
- ADD-METHOD, REMOVE-METHOD, INITIALIZE-INSTANCE and REINITIALIZE-INSTANCE do not determine a new discriminating function. This is postponed until function invocation instead, so shouldn't be a problem in practice.
- COMPUTE-APPLICABLE-METHODS-USING-CLASSES doesn't exist. Fixed.
- DEFGENERIC does not call FIND-METHOD-COMBINATION. Not fixed.
- EQL-SPECIALIZER, EQL-SPECIALIZER-OBJECT and INTERN-EQL-SPECIALIZER don't exist. In LispWorks, eql specializers are lists not objects. I have provided EQL-SPECIALIZER as a type (not as a class) and EQL-SPECIALIZER-OBJECT and INTERN-EQL-SPECIALIZER to work on lists, and a class EQL-SPECIALIZER* and corresponding EQL-SPECIALIZER-OBJECT* and INTERN-EQL-SPECILAIZER* to soften the incompatibilities.
- Before LispWorks 5.1, the :ALLOCATION type cannot be extended. Not fixed.
- FIND-METHOD-COMBINATION doesn't exist. Fixed, but fixed version doesn't work with method combination options.
- FUNCALLABLE-STANDARD-INSTANCE-ACCESS and STANDARD-INSTANCE-ACCESS don't exist. Fixed.
- The function invocation protocol doesn't call COMPUTE-APPLICABLE-METHODS and COMPUTE-APPLICABLE-METHODS-USING-CLASSES. Fixed.
- MAKE-METHOD-LAMBDA expects other parameters than specified. Fixed.
- Method functions don't take parameters as specified in AMOP, but instead just the parameters that the generic function receives. Fixed.
- The slot methods (SLOT-VALUE-USING-CLASS, etc.) are not specialized on effective slot definitions, but on slot names. Fixed.
- The generated accessor methods don't use the slot methods for accessing slots. Fixed. (Don't use :optimize-slot-access to deoptimize slot access, or otherwise the fixed slot access protocol doesn't work anymore!)
- SPECIALIZER-DIRECT-GENERIC-FUNCTIONS doesn't exist. Fixed.
- STANDARD-CLASS and FUNCALLABLE-STANDARD-CLASS are not compatible. Not fixed.
- Subclasses of BUILT-IN-CLASS (fixed), CLASS (fixed), DIRECT-SLOT-DEFINITION, EFFECTIVE-SLOT-DEFINITION, FORWARD-REFERENCED-CLASS (fixed), FUNCALLABLE-STANDARD-CLASS (fixed), SLOT-DEFINITION, STANDARD-ACCESSOR-METHOD, STANDARD-CLASS (fixed), STANDARD-DIRECT-SLOT-DEFINITION, STANDARD-EFFECTIVE-SLOT-DEFINITION, STANDARD-GENERIC-FUNCTION, STANDARD-METHOD, STANDARD-READER-METHOD, STANDARD-SLOT-DEFINITION and STANDARD-WRITER-METHOD will inherit slots whose names are exported symbols and/or accessible in the package common-lisp-user. Not fixed, except where indicated otherwise.

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MCL 5.2.1
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In MCL, generic functions work completely differently than specified. The specific incompatibilities are not listed and are not fixed.

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- The slot order requested by a primary method for COMPUTE-SLOTS is not honoured by this MOP. Not fixed.
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- FUNCALLABLE-STANDARD-OBJECT is not exported. Fixed.
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- REINITIALIZE-INSTANCE of a class metaobject doesn't invoke FINALIZE-INHERITANCE again. Not fixed.
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- The automatically created accessor methods in DEFCLASS forms don't call SLOT-VALUE-USING-CLASS and (SETF SLOT-VALUE-USING-CLASS). Fixed.
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- Subclasses of DIRECT-SLOT-DEFINITION, EFFECTIVE-SLOT-DEFINITION, SLOT-DEFINITION, STANDARD-ACCESSOR-METHOD, STANDARD-DIRECT-SLOT-DEFINITION, STANDARD-EFFECTIVE-SLOT-DEFINITION, STANDARD-GENERIC-FUNCTION, STANDARD-METHOD, STANDARD-READER-METHOD, STANDARD-SLOT-DEFINITION and STANDARD-WRITER-METHOD will inherit slots whose names are exported symbols and/or accessible in the package common-lisp-user. Not fixed.
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SBCL 1.1.3
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All features implemented. (In SBCL 1.0.47, there is a glitch with methods on slot-boundp-using-class, which may not work in all cases.)
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SCL 1.3.9

- The functions ADD-DIRECT-METHOD and REMOVE-DIRECT-METHOD don't exist, and thus are also not called. Partially fixed.
- CLASS-DEFAULT-INITARGS and CLASS-DIRECT-DEFAULT-INITARGS don't exist. Not fixed.
- COMPUTE-EFFECTIVE-METHOD doesn't exist and isn't called. Not fixed.
- MAKE-METHOD-LAMBDA doesn't exist and isn't used. Not fixed.
- The dependent protocols for classes and generic functions are not implemented. Fixed.
- Discriminating functions cannot be funcalled, and it's unclear whether your own discriminating functions may be closures or not. COMPUTE-DISCRIMINATING-FUNCTION exists, but requires an extra 'cache' parameter, whose purpose is not specified. Not fixed.
- EQL-SPECIALIZER is not a class, but only a type. Not fixed, but the implemented behavior should be sufficient for most cases.
- Allocations other than :CLASS and :INSTANCE are not supported. Not fixed.
- STANDARD-INSTANCE-ACCESS and FUNCALLABLE-STANDARD-INSTANCE-ACCESS don't exist. Not fixed.
- COMPUTE-APPLICABLE-METHODS is not invoked when generic functions are called. Not fixed.
- Multiple slot options are not passed as lists to DIRECT-SLOT-DEFINITION-CLASS. Not fixed, but use FIX-SLOT-INITARGS as a workaround.
- Reinitialization of a generic function doesn't trigger recomputing its discriminating function. Not fixed.
- (SETF CLASS-NAME) and (SETF GENERIC-FUNCTION-NAME) are not implemented by way of calling REINITIALIZE-INSTANCE. Not fixed.
- The class SPECIALIZER doesn't exist. Not fixed.
- STANDARD-CLASS and FUNCALLABLE-STANDARD-CLASS are not compatible.
- Subclasses of BUILT-IN-CLASS, CLASS, FORWARD-REFERENCED-CLASS, FUNCALLABLE-STANDARD-CLASS, METHOD-COMBINATION, STANDARD-ACCESSOR-METHOD, STANDARD-CLASS, STANDARD-DIRECT-SLOT-DEFINITION, STANDARD-EFFECTIVE-SLOT-DEFINITION, STANDARD-GENERIC-FUNCTION, STANDARD-METHOD, STANDARD-READER-METHOD, STANDARD-SLOT-DEFINITION, STANDARD-WRITER-METHOD will inherit slots whose names are exported symbols and/or accessible in the package common-lisp-user. Not fixed.
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Some extra notes:
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- Don't rely on FIND-METHOD-COMBINATION to do its job correctly, only when you don't provide method combination options.
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- MAKE-METHOD-LAMBDA works in Allegro, CLisp, Clozure Common Lisp, CMUCL, LispWorks and SBCL as specified (but make sure that the respective generic function and method metaobject classes and make-method-lambda definitions are part of your compilation enviroment).
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- Specialize the methods for the dependent protocol on the class or generic function metaobject class. The example in AMOP doesn't do this but that is fragile code.
- Don't rely on methods being initialized with the specified initargs from inside the MOP.
- If you specialize DIRECT-SLOT-DEFINITION-CLASS, use FIX-SLOT-INITARGS in portable code.
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- AMOP specifies that :declarations is used when initializing generic functions, whereas ANSI Common Lisp specifies that 'declare is used. Since almost all MOP implementations adhere to AMOP in this regard, I have also chosen that path.