erase captures in $/.prune

Author: moritz

src/QRegex/Cursor.nqp

@@ -707,10 +707,7 @@ class NQPMatch is NQPCapture {
 
     method prune() {
         self.capture_prune();
-#        if nqp::defined($!cursor) {
-#            $!cursor.prune();
-            $!cursor := NQPMu;
-#        }
+        $!cursor := NQPMu;
     }
 
     method !make($made) { $!made := $made }

src/core/NQPCapture.nqp

@@ -18,8 +18,8 @@ my class NQPCapture {
     method hash() { %!hash }
 
     method capture_prune() {
-        @!array := nqp::list();
-        %!hash := nqp::hash();
+        @!array := NQPMu;
+        %!hash := NQPMu;
     }
 
 }