Index: libcfa/src/concurrency/coroutine.cfa
===================================================================
--- libcfa/src/concurrency/coroutine.cfa	(revision 848439f8d6e456a0269c3145cc6faa97e77d4637)
+++ libcfa/src/concurrency/coroutine.cfa	(revision 69c5c001921edf7a77ff0c53ac4f0d0e8044b405)
@@ -47,6 +47,5 @@
 
 //-----------------------------------------------------------------------------
-FORALL_DATA_INSTANCE(CoroutineCancelled,
-		(dtype coroutine_t | sized(coroutine_t)), (coroutine_t))
+FORALL_DATA_INSTANCE(CoroutineCancelled, (dtype coroutine_t), (coroutine_t))
 
 struct __cfaehm_node {
@@ -59,5 +58,5 @@
 void mark_exception(CoroutineCancelled(T) *) {}
 
-forall(dtype T | sized(T))
+forall(dtype T)
 void copy(CoroutineCancelled(T) * dst, CoroutineCancelled(T) * src) {
 	dst->the_coroutine = src->the_coroutine;
@@ -77,5 +76,7 @@
 	exception_t * except = (exception_t *)(1 + (__cfaehm_node *)desc->cancellation);
 
+	// TODO: Remove explitate vtable set once trac#186 is fixed.
 	CoroutineCancelled(T) except;
+	except.virtual_table = &get_exception_vtable(&except);
 	except.the_coroutine = &cor;
 	except.the_exception = except;
Index: libcfa/src/concurrency/coroutine.hfa
===================================================================
--- libcfa/src/concurrency/coroutine.hfa	(revision 848439f8d6e456a0269c3145cc6faa97e77d4637)
+++ libcfa/src/concurrency/coroutine.hfa	(revision 69c5c001921edf7a77ff0c53ac4f0d0e8044b405)
@@ -22,7 +22,5 @@
 //-----------------------------------------------------------------------------
 // Exception thrown from resume when a coroutine stack is cancelled.
-// Should not have to be be sized (see trac #196).
-FORALL_DATA_EXCEPTION(CoroutineCancelled,
-		(dtype coroutine_t | sized(coroutine_t)), (coroutine_t)) (
+FORALL_DATA_EXCEPTION(CoroutineCancelled, (dtype coroutine_t), (coroutine_t)) (
 	coroutine_t * the_coroutine;
 	exception_t * the_exception;
@@ -30,7 +28,4 @@
 
 forall(dtype T)
-void mark_exception(CoroutineCancelled(T) *);
-
-forall(dtype T | sized(T))
 void copy(CoroutineCancelled(T) * dst, CoroutineCancelled(T) * src);
 
@@ -42,7 +37,7 @@
 // Anything that implements this trait can be resumed.
 // Anything that is resumed is a coroutine.
-trait is_coroutine(dtype T | sized(T)
-		| is_resumption_exception(CoroutineCancelled(T))
-		| VTABLE_ASSERTION(CoroutineCancelled, (T))) {
+trait is_coroutine(dtype T
+		| is_resumption_exception(CoroutineCancelled(T),
+			CoroutineCancelled_vtable(T))) {
 	void main(T & this);
 	$coroutine * get_coroutine(T & this);