Simply multi method construction and dispatcher testing.

Author: jnthn

src/NQP/Actions.pm

@@ -814,15 +814,8 @@ class NQP::Actions is HLL::Actions {
             my $name := ~$<private> ~ ~$<deflongname>[0].ast;
             $past.name($name);
 
-            # If it's a proto, we'll mark it as such by giving it an empty candidate
-            # list. Also need to set sub PMC type to DispatcherSub.
-            my $to_add := $*MULTINESS ne 'proto' ??
-                PAST::Val.new( :value($past) ) !!
-                PAST::Op.new(
-                    :pirop('set_dispatchees 0PP'),
-                    PAST::Val.new( :value($past) ),
-                    PAST::Op.new( :pasttype('list') )
-                );
+            # If it's a proto, we'll mark it as such setting the sub PMC
+            # type to DispatcherSub.
             if $*MULTINESS eq 'proto' { $past.pirflags(':instanceof("DispatcherSub")'); }
 
             # If it is a multi, we need to build a type signature object for
@@ -840,7 +833,7 @@ class NQP::Actions is HLL::Actions {
                     ),
                     PAST::Var.new( :name('type_obj'), :scope('register') ),
                     PAST::Val.new( :value($name) ),
-                    $to_add
+                    PAST::Val.new( :value($past) )
                 ));
             }
 

src/ops/nqp.ops

@@ -625,8 +625,11 @@ Adds a single new code object to the end of a dispatcher's dispatchee list.
 
 */
 inline op push_dispatchee(in PMC, in PMC) :base_core {
-    if ($1->vtable->base_type == disp_id)
+    if ($1->vtable->base_type == disp_id) {
+        if (PMC_IS_NULL(PARROT_DISPATCHERSUB($1)->dispatchees))
+            PARROT_DISPATCHERSUB($1)->dispatchees = pmc_new(interp, enum_class_ResizablePMCArray);
         VTABLE_push_pmc(interp, PARROT_DISPATCHERSUB($1)->dispatchees, $2);
+    }
     else
         Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_INVALID_OPERATION,
             "Can only use push_dispatchee if first operand is a DispatcherSub.");
@@ -643,8 +646,7 @@ list of dispatchees).
 
 */
 inline op is_dispatcher(out INT, in PMC) :base_core {
-    $1 = $2->vtable->base_type == disp_id && 
-            !PMC_IS_NULL(PARROT_DISPATCHERSUB($2)->dispatchees);
+    $1 = $2->vtable->base_type == disp_id;
 }
 
 /*

src/pmc/dispatchersub.pmc

@@ -3,7 +3,7 @@
 pmclass DispatcherSub extends Sub auto_attrs dynpmc group nqp {
     ATTR PMC *dispatchees;     /* Used if this code object is a dispatcher. */
     ATTR PMC *dispatch_cache;  /* Holds a (multi-)dispatch cache if needed. */
-
+    
     VTABLE void mark() {
         PMC *dispatchees;
         SUPER();