Accomodate children iterable for specialization

pmd-core/src/main/java/net/sourceforge/pmd/lang/ast/impl/javacc/AbstractJjtreeNode.java

@@ -43,7 +43,7 @@ public abstract class AbstractJjtreeNode<N extends Node> extends AbstractNode {
 
     @Override
     @SuppressWarnings("unchecked")
-    public Iterable<N> children() {
+    public Iterable<? extends N> children() {
         return (Iterable<N>) super.children();
     }
 }

pmd-java/src/main/java/net/sourceforge/pmd/lang/java/ast/JavaNode.java

@@ -51,7 +51,7 @@ public interface JavaNode extends ScopedNode {
 
 
     @Override
-    Iterable<JavaNode> children();
+    Iterable<? extends JavaNode> children();
 
 
     @InternalApi

pmd-jsp/src/main/java/net/sourceforge/pmd/lang/jsp/ast/JspNode.java

@@ -32,5 +32,5 @@ public interface JspNode extends Node {
 
 
     @Override
-    Iterable<JspNode> children();
+    Iterable<? extends JspNode> children();
 }

pmd-modelica/src/main/java/net/sourceforge/pmd/lang/modelica/ast/ModelicaNode.java

@@ -35,5 +35,5 @@ public interface ModelicaNode extends Node {
 
 
     @Override
-    Iterable<ModelicaNode> children();
+    Iterable<? extends ModelicaNode> children();
 }

pmd-plsql/src/main/java/net/sourceforge/pmd/lang/plsql/ast/PLSQLNode.java

@@ -36,5 +36,5 @@ public interface PLSQLNode extends Node, ScopedNode {
 
 
     @Override
-    Iterable<PLSQLNode> children();
+    Iterable<? extends PLSQLNode> children();
 }

pmd-scala/src/main/java/net/sourceforge/pmd/lang/scala/ast/AbstractScalaNode.java

@@ -34,7 +34,7 @@ abstract class AbstractScalaNode<T extends Tree> extends AbstractNode implements
 
     @Override
     @SuppressWarnings("unchecked")
-    public Iterable<ScalaNode<?>> children() {
+    public Iterable<? extends ScalaNode<?>> children() {
         return (Iterable<ScalaNode<?>>) super.children();
     }
 

pmd-scala/src/main/java/net/sourceforge/pmd/lang/scala/ast/ScalaNode.java

@@ -62,5 +62,5 @@ public interface ScalaNode<T extends Tree> extends Node {
 
 
     @Override
-    Iterable<ScalaNode<?>> children();
+    Iterable<? extends ScalaNode<?>> children();
 }

pmd-visualforce/src/main/java/net/sourceforge/pmd/lang/vf/ast/VfNode.java

@@ -34,5 +34,5 @@ public interface VfNode extends Node {
 
 
     @Override
-    Iterable<VfNode> children();
+    Iterable<? extends VfNode> children();
 }

pmd-vm/src/main/java/net/sourceforge/pmd/lang/vm/ast/VmNode.java

@@ -32,6 +32,6 @@ public interface VmNode extends Node {
 
 
     @Override
-    Iterable<VmNode> children();
+    Iterable<? extends VmNode> children();
 
 }