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diff --git a/tests/clos.impure-cload.lisp b/tests/clos.impure-cload.lisp
index b5c96f0..d866200 100644
--- a/tests/clos.impure-cload.lisp
+++ b/tests/clos.impure-cload.lisp
@@ -54,5 +54,46 @@
 (class-allocation-writer 4)
 (assert (= (class-allocation-reader) 4))
 
+;;; from James Anderson via Gerd Moellmann: defining methods with
+;;; specializers with forward-referenced superclasses used not to
+;;; work.
+(defclass specializer1 () ())
+(defclass specializer2 (forward-ref1) ())
+(defmethod baz ((x specializer2)) x)
+(defmethod baz ((x specializer1)) x)
+(assert (typep (baz (make-instance 'specializer1)) 'specializer1))
+
+;;; ... and from McCLIM, another test case:
+(defclass specializer1a (specializer2a specializer2b) ())
+(defclass specializer2a () ())
+(defmethod initialize-instance :after
+    ((obj specializer2a) &key &allow-other-keys)
+  (print obj))
+
+;;; in a similar vein, we should be able to define methods on classes
+;;; that are effectively unknown to the type system:
+(sb-mop:ensure-class 'unknown-type)
+(defmethod method ((x unknown-type)) x)
+;;; (we can't call it without defining methods on allocate-instance
+;;; etc., but we should be able to define it).
+
+;;; the ctor MAKE-INSTANCE optimizer used not to handle duplicate
+;;; initargs...
+(defclass dinitargs-class1 ()
+  ((a :initarg :a)))
+(assert (= (slot-value (make-instance 'dinitargs-class1 :a 1 :a 2) 'a) 1))
+
+(defclass dinitargs-class2 ()
+  ((b :initarg :b1 :initarg :b2)))
+(assert (= (slot-value (make-instance 'dinitargs-class2 :b2 3 :b1 4) 'b) 3))
+;;; ... or default-initargs when the location was already initialized
+(defvar *definitargs-counter* 0)
+(defclass definitargs-class ()
+  ((a :initarg :a :initarg :a2))
+  (:default-initargs :a2 (incf *definitargs-counter*)))
+(assert (= (slot-value (make-instance 'definitargs-class) 'a) 1))
+(assert (= (slot-value (make-instance 'definitargs-class :a 0) 'a) 0))
+(assert (= *definitargs-counter* 2))
+
 ;;; success
 (sb-ext:quit :unix-status 104)
\ No newline at end of file