From fcadecb8cfa116c7a4188291261d7c1e8decbc0a Mon Sep 17 00:00:00 2001
From: Fedor Isakov <fisakov@gmail.com>
Date: Mon, 21 Jul 2014 13:19:51 +0200
Subject: [PATCH] Support for copying the subtrees

---
 .../models/jetbrains/mps/unification/ast.mps  | 742 +++++++++++++++++-
 .../models/jetbrains/mps/unification/tree.mps | 320 +++++++-
 2 files changed, 1017 insertions(+), 45 deletions(-)

diff --git a/solutions/jetbrains.mps.unification/models/jetbrains/mps/unification/ast.mps b/solutions/jetbrains.mps.unification/models/jetbrains/mps/unification/ast.mps
index af1bca81..d3a18469 100644
--- a/solutions/jetbrains.mps.unification/models/jetbrains/mps/unification/ast.mps
+++ b/solutions/jetbrains.mps.unification/models/jetbrains/mps/unification/ast.mps
@@ -4,9 +4,9 @@
   <devkit namespace="fbc25dd2-5da4-483a-8b19-70928e1b62d7(jetbrains.mps.devkit.general-purpose)" />
   <import index="ie8e" modelUID="r:ab2605ab-b4bc-4e80-a8ca-19a4a8465c01(jetbrains.mps.unification.tree)" version="-1" />
   <import index="jfki" modelUID="f:java_stub#7526e0cf-1ce7-46f8-a555-9eca1e06c23b#jetbrains.mps.unification(jetbrains.mps.unification@java_stub)" version="-1" />
+  <import index="e2lb" modelUID="f:java_stub#6354ebe7-c22a-4a0f-ac54-50b52ab9b065#java.lang(JDK/java.lang@java_stub)" version="-1" />
   <import index="tpee" modelUID="r:00000000-0000-4000-0000-011c895902ca(jetbrains.mps.baseLanguage.structure)" version="5" implicit="yes" />
   <import index="tpck" modelUID="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" version="0" implicit="yes" />
-  <import index="e2lb" modelUID="f:java_stub#6354ebe7-c22a-4a0f-ac54-50b52ab9b065#java.lang(JDK/java.lang@java_stub)" version="-1" implicit="yes" />
   <import index="tp2c" modelUID="r:00000000-0000-4000-0000-011c89590338(jetbrains.mps.baseLanguage.closures.structure)" version="3" implicit="yes" />
   <import index="tp2q" modelUID="r:00000000-0000-4000-0000-011c8959032e(jetbrains.mps.baseLanguage.collections.structure)" version="7" implicit="yes" />
   <root type="tpee.ClassConcept" typeId="tpee.1068390468198" id="2154023965590888595" nodeInfo="ig">
@@ -102,8 +102,8 @@
       <node role="parameter" roleId="tpee.1068580123134" type="tpee.ParameterDeclaration" typeId="tpee.1068498886292" id="7571593955702992295" nodeInfo="ir">
         <property name="name" nameId="tpck.1169194664001" value="children" />
         <node role="type" roleId="tpee.5680397130376446158" type="tpee.VariableArityType" typeId="tpee.1219920932475" id="7571593955702992296" nodeInfo="in">
-          <node role="componentType" roleId="tpee.1219921048460" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="7571593955705560590" nodeInfo="in">
-            <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+          <node role="componentType" roleId="tpee.1219921048460" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818383297761" nodeInfo="in">
+            <link role="classifier" roleId="tpee.1107535924139" targetNodeId="ie8e.1357303818382341941" resolveInfo="ITreePart" />
           </node>
         </node>
       </node>
@@ -133,8 +133,8 @@
       </node>
       <node role="typeVariableDeclaration" roleId="tpee.1109279881614" type="tpee.TypeVariableDeclaration" typeId="tpee.1109279763828" id="7571593955702992308" nodeInfo="ng">
         <property name="name" nameId="tpck.1169194664001" value="T" />
-        <node role="bound" roleId="tpee.1214996921760" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="7571593955702992309" nodeInfo="in">
-          <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+        <node role="bound" roleId="tpee.1214996921760" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818383286125" nodeInfo="in">
+          <link role="classifier" roleId="tpee.1107535924139" targetNodeId="ie8e.1357303818382341941" resolveInfo="ITreePart" />
         </node>
       </node>
     </node>
@@ -391,8 +391,8 @@
       </node>
       <node role="typeVariableDeclaration" roleId="tpee.1109279881614" type="tpee.TypeVariableDeclaration" typeId="tpee.1109279763828" id="7571593955704997807" nodeInfo="ng">
         <property name="name" nameId="tpck.1169194664001" value="T" />
-        <node role="bound" roleId="tpee.1214996921760" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="7571593955704997808" nodeInfo="in">
-          <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+        <node role="bound" roleId="tpee.1214996921760" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818383314055" nodeInfo="in">
+          <link role="classifier" roleId="tpee.1107535924139" targetNodeId="ie8e.1357303818382341941" resolveInfo="ITreePart" />
         </node>
       </node>
     </node>
@@ -418,8 +418,8 @@
       <node role="parameter" roleId="tpee.1068580123134" type="tpee.ParameterDeclaration" typeId="tpee.1068498886292" id="7571593955703418336" nodeInfo="ir">
         <property name="name" nameId="tpck.1169194664001" value="elements" />
         <node role="type" roleId="tpee.5680397130376446158" type="tpee.VariableArityType" typeId="tpee.1219920932475" id="7571593955703418801" nodeInfo="in">
-          <node role="componentType" roleId="tpee.1219921048460" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="7571593955704984972" nodeInfo="in">
-            <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+          <node role="componentType" roleId="tpee.1219921048460" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818383063309" nodeInfo="in">
+            <link role="classifier" roleId="tpee.1107535924139" targetNodeId="ie8e.1357303818382341941" resolveInfo="ITreePart" />
           </node>
         </node>
       </node>
@@ -472,8 +472,9 @@
       </node>
       <node role="typeVariableDeclaration" roleId="tpee.1109279881614" type="tpee.TypeVariableDeclaration" typeId="tpee.1109279763828" id="7571593955704381625" nodeInfo="ng">
         <property name="name" nameId="tpck.1169194664001" value="T" />
-        <node role="bound" roleId="tpee.1214996921760" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="7571593955704400314" nodeInfo="in">
-          <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+        <node role="bound" roleId="tpee.1214996921760" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818383044730" nodeInfo="in">
+          <link role="classifier" roleId="tpee.1107535924139" targetNodeId="ie8e.1357303818382341941" resolveInfo="ITreePart" />
+          <node role="parameter" roleId="tpee.1109201940907" type="tpee.WildCardType" typeId="tpee.1171903607971" id="1357303818383540694" nodeInfo="in" />
         </node>
       </node>
     </node>
@@ -491,8 +492,8 @@
       <node role="parameter" roleId="tpee.1068580123134" type="tpee.ParameterDeclaration" typeId="tpee.1068498886292" id="7571593955703492205" nodeInfo="ir">
         <property name="name" nameId="tpck.1169194664001" value="elements" />
         <node role="type" roleId="tpee.5680397130376446158" type="tpee.ArrayType" typeId="tpee.1070534760951" id="7571593955703492759" nodeInfo="in">
-          <node role="componentType" roleId="tpee.1070534760952" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="7571593955703492562" nodeInfo="in">
-            <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+          <node role="componentType" roleId="tpee.1070534760952" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818383066671" nodeInfo="in">
+            <link role="classifier" roleId="tpee.1107535924139" targetNodeId="ie8e.1357303818382341941" resolveInfo="ITreePart" />
           </node>
         </node>
       </node>
@@ -506,8 +507,8 @@
             <node role="statement" roleId="tpee.1068581517665" type="tpee.LocalVariableDeclarationStatement" typeId="tpee.1068581242864" id="1611448358170566971" nodeInfo="nn">
               <node role="localVariableDeclaration" roleId="tpee.1068581242865" type="tpee.LocalVariableDeclaration" typeId="tpee.1068581242863" id="1611448358170566972" nodeInfo="nr">
                 <property name="name" nameId="tpck.1169194664001" value="head" />
-                <node role="type" roleId="tpee.5680397130376446158" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1611448358170566961" nodeInfo="in">
-                  <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+                <node role="type" roleId="tpee.5680397130376446158" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818384228962" nodeInfo="in">
+                  <link role="classifier" roleId="tpee.1107535924139" targetNodeId="ie8e.1357303818382341941" resolveInfo="ITreePart" />
                 </node>
                 <node role="initializer" roleId="tpee.1068431790190" type="tpee.ArrayAccessExpression" typeId="tpee.1173175405605" id="1611448358170566973" nodeInfo="nn">
                   <node role="index" roleId="tpee.1173175577737" type="tpee.VariableReference" typeId="tpee.1068498886296" id="1611448358170566974" nodeInfo="nn">
@@ -562,6 +563,7 @@
                 </node>
               </node>
             </node>
+            <node role="statement" roleId="tpee.1068581517665" type="tpee.Statement" typeId="tpee.1068580123157" id="1357303818385771455" nodeInfo="nn" />
             <node role="statement" roleId="tpee.1068581517665" type="tpee.SingleLineComment" typeId="tpee.6329021646629104954" id="1611448358170644769" nodeInfo="nn">
               <node role="commentPart" roleId="tpee.6329021646629175155" type="tpee.TextCommentPart" typeId="tpee.6329021646629104957" id="1611448358170646190" nodeInfo="nn">
                 <property name="text" nameId="tpee.6329021646629104958" value="TODO this smells" />
@@ -611,6 +613,7 @@
                 </node>
               </node>
             </node>
+            <node role="statement" roleId="tpee.1068581517665" type="tpee.Statement" typeId="tpee.1068580123157" id="1357303818385775217" nodeInfo="nn" />
             <node role="statement" roleId="tpee.1068581517665" type="tpee.ExpressionStatement" typeId="tpee.1068580123155" id="7571593955703914617" nodeInfo="nn">
               <node role="expression" roleId="tpee.1068580123156" type="tpee.DotExpression" typeId="tpee.1197027756228" id="7571593955703959852" nodeInfo="nn">
                 <node role="operand" roleId="tpee.1197027771414" type="tpee.DotExpression" typeId="tpee.1197027756228" id="7571593955703916042" nodeInfo="nn">
@@ -634,6 +637,7 @@
                 <link role="variableDeclaration" roleId="tpee.1068581517664" targetNodeId="7571593955703911639" resolveInfo="cons" />
               </node>
             </node>
+            <node role="statement" roleId="tpee.1068581517665" type="tpee.Statement" typeId="tpee.1068580123157" id="1357303818385869355" nodeInfo="nn" />
           </node>
           <node role="condition" roleId="tpee.1068580123160" type="tpee.LessThanExpression" typeId="tpee.1081506773034" id="7571593955703501180" nodeInfo="nn">
             <node role="rightExpression" roleId="tpee.1081773367579" type="tpee.DotExpression" typeId="tpee.1197027756228" id="7571593955703501921" nodeInfo="nn">
@@ -690,6 +694,7 @@
                   <link role="variableDeclaration" roleId="tpee.1068581517664" targetNodeId="7571593955704657407" resolveInfo="nil" />
                 </node>
               </node>
+              <node role="statement" roleId="tpee.1068581517665" type="tpee.Statement" typeId="tpee.1068580123157" id="1357303818385873173" nodeInfo="nn" />
             </node>
           </node>
         </node>
@@ -703,11 +708,235 @@
       </node>
       <node role="typeVariableDeclaration" roleId="tpee.1109279881614" type="tpee.TypeVariableDeclaration" typeId="tpee.1109279763828" id="7571593955703491726" nodeInfo="ng">
         <property name="name" nameId="tpck.1169194664001" value="T" />
-        <node role="bound" roleId="tpee.1214996921760" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="7571593955703491931" nodeInfo="in">
-          <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+        <node role="bound" roleId="tpee.1214996921760" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818383064940" nodeInfo="in">
+          <link role="classifier" roleId="tpee.1107535924139" targetNodeId="ie8e.1357303818382341941" resolveInfo="ITreePart" />
         </node>
       </node>
     </node>
+    <node role="member" roleId="tpee.5375687026011219971" type="tpee.PlaceholderMember" typeId="tpee.1465982738277781862" id="1357303818384576291" nodeInfo="ngu" />
+    <node role="member" roleId="tpee.5375687026011219971" type="tpee.StaticMethodDeclaration" typeId="tpee.1081236700938" id="1357303818386070023" nodeInfo="igu">
+      <property name="name" nameId="tpck.1169194664001" value="prependPath" />
+      <property name="isDeprecated" nameId="tpee.1224848525476" value="false" />
+      <property name="isFinal" nameId="tpee.1181808852946" value="false" />
+      <property name="isSynchronized" nameId="tpee.4276006055363816570" value="false" />
+      <node role="body" roleId="tpee.1068580123135" type="tpee.StatementList" typeId="tpee.1068580123136" id="1357303818384594415" nodeInfo="sn">
+        <node role="statement" roleId="tpee.1068581517665" type="tpee.IfStatement" typeId="tpee.1068580123159" id="1357303818384689967" nodeInfo="nn">
+          <node role="ifTrue" roleId="tpee.1068580123161" type="tpee.StatementList" typeId="tpee.1068580123136" id="1357303818384689970" nodeInfo="sn">
+            <node role="statement" roleId="tpee.1068581517665" type="tpee.LocalVariableDeclarationStatement" typeId="tpee.1068581242864" id="1357303818385333882" nodeInfo="nn">
+              <node role="localVariableDeclaration" roleId="tpee.1068581242865" type="tpee.LocalVariableDeclaration" typeId="tpee.1068581242863" id="1357303818385333883" nodeInfo="nr">
+                <property name="name" nameId="tpck.1169194664001" value="cons" />
+                <node role="type" roleId="tpee.5680397130376446158" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818385333880" nodeInfo="in">
+                  <link role="classifier" roleId="tpee.1107535924139" targetNodeId="7571593955703167503" resolveInfo="ListBranch.Cons" />
+                  <node role="parameter" roleId="tpee.1109201940907" type="tpee.TypeVariableReference" typeId="tpee.1109283449304" id="1357303818385345029" nodeInfo="in">
+                    <link role="typeVariableDeclaration" roleId="tpee.1109283546497" targetNodeId="1357303818384647443" resolveInfo="T" />
+                  </node>
+                </node>
+                <node role="initializer" roleId="tpee.1068431790190" type="tpee.CastExpression" typeId="tpee.1070534934090" id="1357303818385349193" nodeInfo="nn">
+                  <node role="type" roleId="tpee.1070534934091" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818385349190" nodeInfo="in">
+                    <link role="classifier" roleId="tpee.1107535924139" targetNodeId="7571593955703167503" resolveInfo="ListBranch.Cons" />
+                    <node role="parameter" roleId="tpee.1109201940907" type="tpee.TypeVariableReference" typeId="tpee.1109283449304" id="1357303818385349191" nodeInfo="in">
+                      <link role="typeVariableDeclaration" roleId="tpee.1109283546497" targetNodeId="1357303818384647443" resolveInfo="T" />
+                    </node>
+                  </node>
+                  <node role="expression" roleId="tpee.1070534934092" type="tpee.VariableReference" typeId="tpee.1068498886296" id="1357303818385349192" nodeInfo="nn">
+                    <link role="variableDeclaration" roleId="tpee.1068581517664" targetNodeId="1357303818384631960" resolveInfo="list" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node role="statement" roleId="tpee.1068581517665" type="tpee.LocalVariableDeclarationStatement" typeId="tpee.1068581242864" id="1357303818385738032" nodeInfo="nn">
+              <node role="localVariableDeclaration" roleId="tpee.1068581242865" type="tpee.LocalVariableDeclaration" typeId="tpee.1068581242863" id="1357303818385738033" nodeInfo="nr">
+                <property name="name" nameId="tpck.1169194664001" value="head" />
+                <node role="type" roleId="tpee.5680397130376446158" type="tpee.TypeVariableReference" typeId="tpee.1109283449304" id="1357303818385738014" nodeInfo="in">
+                  <link role="typeVariableDeclaration" roleId="tpee.1109283546497" targetNodeId="1357303818384647443" resolveInfo="T" />
+                </node>
+                <node role="initializer" roleId="tpee.1068431790190" type="tpee.DotExpression" typeId="tpee.1197027756228" id="1357303818385738034" nodeInfo="nn">
+                  <node role="operand" roleId="tpee.1197027771414" type="tpee.VariableReference" typeId="tpee.1068498886296" id="1357303818385738035" nodeInfo="nn">
+                    <link role="variableDeclaration" roleId="tpee.1068581517664" targetNodeId="1357303818385333883" resolveInfo="cons" />
+                  </node>
+                  <node role="operation" roleId="tpee.1197027833540" type="tpee.InstanceMethodCallOperation" typeId="tpee.1202948039474" id="1357303818385738036" nodeInfo="nn">
+                    <link role="baseMethodDeclaration" roleId="tpee.1068499141037" targetNodeId="1357303818385630976" resolveInfo="head" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node role="statement" roleId="tpee.1068581517665" type="tpee.Statement" typeId="tpee.1068580123157" id="1357303818385363970" nodeInfo="nn" />
+            <node role="statement" roleId="tpee.1068581517665" type="tpee.SingleLineComment" typeId="tpee.6329021646629104954" id="1357303818385151581" nodeInfo="nn">
+              <node role="commentPart" roleId="tpee.6329021646629175155" type="tpee.TextCommentPart" typeId="tpee.6329021646629104957" id="1357303818385151582" nodeInfo="nn">
+                <property name="text" nameId="tpee.6329021646629104958" value="TODO this smells" />
+              </node>
+            </node>
+            <node role="statement" roleId="tpee.1068581517665" type="tpee.IfStatement" typeId="tpee.1068580123159" id="1357303818385151583" nodeInfo="nn">
+              <node role="ifTrue" roleId="tpee.1068580123161" type="tpee.StatementList" typeId="tpee.1068580123136" id="1357303818385151584" nodeInfo="sn">
+                <node role="statement" roleId="tpee.1068581517665" type="tpee.ExpressionStatement" typeId="tpee.1068580123155" id="1357303818385151585" nodeInfo="nn">
+                  <node role="expression" roleId="tpee.1068580123156" type="tpee.DotExpression" typeId="tpee.1197027756228" id="1357303818385151586" nodeInfo="nn">
+                    <node role="operand" roleId="tpee.1197027771414" type="tpee.ParenthesizedExpression" typeId="tpee.1079359253375" id="1357303818385151587" nodeInfo="nn">
+                      <node role="expression" roleId="tpee.1079359253376" type="tpee.CastExpression" typeId="tpee.1070534934090" id="1357303818385151588" nodeInfo="nn">
+                        <node role="type" roleId="tpee.1070534934091" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818385151589" nodeInfo="in">
+                          <link role="classifier" roleId="tpee.1107535924139" targetNodeId="ie8e.2154023965589875834" resolveInfo="Path" />
+                        </node>
+                        <node role="expression" roleId="tpee.1070534934092" type="tpee.DotExpression" typeId="tpee.1197027756228" id="1357303818385151590" nodeInfo="nn">
+                          <node role="operand" roleId="tpee.1197027771414" type="tpee.ParenthesizedExpression" typeId="tpee.1079359253375" id="1357303818385151591" nodeInfo="nn">
+                            <node role="expression" roleId="tpee.1079359253376" type="tpee.CastExpression" typeId="tpee.1070534934090" id="1357303818385151592" nodeInfo="nn">
+                              <node role="type" roleId="tpee.1070534934091" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818385151593" nodeInfo="in">
+                                <link role="classifier" roleId="tpee.1107535924139" targetNodeId="ie8e.1557167973736049220" resolveInfo="Branch" />
+                              </node>
+                              <node role="expression" roleId="tpee.1070534934092" type="tpee.VariableReference" typeId="tpee.1068498886296" id="1357303818385151594" nodeInfo="nn">
+                                <link role="variableDeclaration" roleId="tpee.1068581517664" targetNodeId="1357303818385738033" resolveInfo="head" />
+                              </node>
+                            </node>
+                          </node>
+                          <node role="operation" roleId="tpee.1197027833540" type="tpee.InstanceMethodCallOperation" typeId="tpee.1202948039474" id="1357303818385151595" nodeInfo="nn">
+                            <link role="baseMethodDeclaration" roleId="tpee.1068499141037" targetNodeId="ie8e.2154023965590517293" resolveInfo="symbol" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                    <node role="operation" roleId="tpee.1197027833540" type="tpee.InstanceMethodCallOperation" typeId="tpee.1202948039474" id="1357303818385151596" nodeInfo="nn">
+                      <link role="baseMethodDeclaration" roleId="tpee.1068499141037" targetNodeId="ie8e.2154023965589878284" resolveInfo="prepend" />
+                      <node role="actualArgument" roleId="tpee.1068499141038" type="tpee.VariableReference" typeId="tpee.1068498886296" id="1357303818385151597" nodeInfo="nn">
+                        <link role="variableDeclaration" roleId="tpee.1068581517664" targetNodeId="1357303818384657775" resolveInfo="parentPath" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node role="condition" roleId="tpee.1068580123160" type="tpee.InstanceOfExpression" typeId="tpee.1081256982272" id="1357303818385151598" nodeInfo="nn">
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+                <node role="actualArgument" roleId="tpee.1068499141038" type="tpee.VariableReference" typeId="tpee.1068498886296" id="1357303818385853303" nodeInfo="nn">
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+            </node>
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+              <node role="operation" roleId="tpee.1197027833540" type="tpee.InstanceMethodCallOperation" typeId="tpee.1202948039474" id="1357303818384851822" nodeInfo="nn">
+                <link role="baseMethodDeclaration" roleId="tpee.1068499141037" targetNodeId="1357303818384777869" resolveInfo="isNil" />
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+            </node>
+          </node>
+          <node role="condition" roleId="tpee.1068580123160" type="tpee.DotExpression" typeId="tpee.1197027756228" id="1357303818384838707" nodeInfo="nn">
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+          <node role="ifFalseStatement" roleId="tpee.1082485599094" type="tpee.BlockStatement" typeId="tpee.1082485599095" id="1357303818384853972" nodeInfo="nn">
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+              <node role="statement" roleId="tpee.1068581517665" type="tpee.SingleLineComment" typeId="tpee.6329021646629104954" id="1357303818384962086" nodeInfo="nn">
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+                  <property name="text" nameId="tpee.6329021646629104958" value="TODO: implement me" />
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+              <node role="statement" roleId="tpee.1068581517665" type="tpee.ThrowStatement" typeId="tpee.1164991038168" id="1357303818386573751" nodeInfo="nn">
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+        <property name="name" nameId="tpck.1169194664001" value="T" />
+        <node role="bound" roleId="tpee.1214996921760" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818384656791" nodeInfo="in">
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+      <node role="visibility" roleId="tpee.1178549979242" type="tpee.PrivateVisibility" typeId="tpee.1146644623116" id="1357303818386085600" nodeInfo="nn" />
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@@ -728,8 +957,8 @@
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-                  <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+                <node role="componentType" roleId="tpee.1154542793668" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818386647446" nodeInfo="in">
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@@ -776,8 +1005,8 @@
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-                  <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+                <node role="componentType" roleId="tpee.1154542793668" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818386634701" nodeInfo="in">
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@@ -793,8 +1022,8 @@
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-          <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+        <node role="type" roleId="tpee.5680397130376446158" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818386643795" nodeInfo="in">
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@@ -824,8 +1053,8 @@
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-                  <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+                <node role="componentType" roleId="tpee.1154542793668" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818386632084" nodeInfo="in">
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@@ -841,6 +1070,99 @@
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+    <node role="member" roleId="tpee.5375687026011219971" type="tpee.InstanceMethodDeclaration" typeId="tpee.1068580123165" id="1357303818382895115" nodeInfo="igu">
+      <property name="isAbstract" nameId="tpee.1178608670077" value="false" />
+      <property name="name" nameId="tpck.1169194664001" value="copyRecursively" />
+      <node role="returnType" roleId="tpee.1068580123133" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818382895116" nodeInfo="in">
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+        <node role="parameter" roleId="tpee.1109201940907" type="tpee.TypeVariableReference" typeId="tpee.1109283449304" id="1357303818382895121" nodeInfo="in">
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+      <node role="visibility" roleId="tpee.1178549979242" type="tpee.PublicVisibility" typeId="tpee.1146644602865" id="1357303818382895118" nodeInfo="nn" />
+      <node role="annotation" roleId="tpee.1188208488637" type="tpee.AnnotationInstance" typeId="tpee.1188207840427" id="1357303818382895120" nodeInfo="nn">
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+                    <node role="actualArgument" roleId="tpee.1068499141038" type="tpee.IntegerConstant" typeId="tpee.1068580320020" id="1357303818386437298" nodeInfo="nn">
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diff --git a/solutions/jetbrains.mps.unification/models/jetbrains/mps/unification/tree.mps b/solutions/jetbrains.mps.unification/models/jetbrains/mps/unification/tree.mps
index 9b6168be..c624148e 100644
--- a/solutions/jetbrains.mps.unification/models/jetbrains/mps/unification/tree.mps
+++ b/solutions/jetbrains.mps.unification/models/jetbrains/mps/unification/tree.mps
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+            <node role="actualArgument" roleId="tpee.1068499141038" type="tpee.LocalMethodCall" typeId="tpee.7812454656619025412" id="1357303818382417593" nodeInfo="nn">
+              <link role="baseMethodDeclaration" roleId="tpee.1068499141037" targetNodeId="1357303818382410122" resolveInfo="childrenArr" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
     <node role="member" roleId="tpee.5375687026011219971" type="tpee.PlaceholderMember" typeId="tpee.1465982738277781862" id="554885619701752264" nodeInfo="ngu" />
     <node role="member" roleId="tpee.5375687026011219971" type="tpee.InstanceMethodDeclaration" typeId="tpee.1068580123165" id="554885619701757432" nodeInfo="igu">
       <property name="isAbstract" nameId="tpee.1178608670077" value="false" />
@@ -1819,7 +2088,7 @@
                               <link role="variableDeclaration" roleId="tpee.1068581517664" targetNodeId="554885619701765780" resolveInfo="v" />
                             </node>
                             <node role="operation" roleId="tpee.1197027833540" type="tpee.InstanceMethodCallOperation" typeId="tpee.1202948039474" id="554885619701765779" nodeInfo="nn">
-                              <link role="baseMethodDeclaration" roleId="tpee.1068499141037" targetNodeId="e2lb.~Object%dtoString()%cjava%dlang%dString" resolveInfo="toString" />
+                              <link role="baseMethodDeclaration" roleId="tpee.1068499141037" targetNodeId="554885619701960756" resolveInfo="toString" />
                             </node>
                           </node>
                         </node>
@@ -2232,5 +2501,32 @@
     </node>
     <node role="visibility" roleId="tpee.1178549979242" type="tpee.PublicVisibility" typeId="tpee.1146644602865" id="2154023965589875835" nodeInfo="nn" />
   </root>
+  <root type="tpee.Interface" typeId="tpee.1107796713796" id="1357303818382341941" nodeInfo="ig">
+    <property name="name" nameId="tpck.1169194664001" value="ITreePart" />
+    <node role="member" roleId="tpee.5375687026011219971" type="tpee.PlaceholderMember" typeId="tpee.1465982738277781862" id="1357303818382343346" nodeInfo="ngu" />
+    <node role="member" roleId="tpee.5375687026011219971" type="tpee.InstanceMethodDeclaration" typeId="tpee.1068580123165" id="1357303818382343406" nodeInfo="igu">
+      <property name="isAbstract" nameId="tpee.1178608670077" value="true" />
+      <property name="name" nameId="tpck.1169194664001" value="copyRecursively" />
+      <node role="returnType" roleId="tpee.1068580123133" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818386326549" nodeInfo="in">
+        <link role="classifier" roleId="tpee.1107535924139" targetNodeId="1357303818382341941" resolveInfo="ITreePart" />
+        <node role="parameter" roleId="tpee.1109201940907" type="tpee.TypeVariableReference" typeId="tpee.1109283449304" id="1357303818386337109" nodeInfo="in">
+          <link role="typeVariableDeclaration" roleId="tpee.1109283546497" targetNodeId="1357303818382685611" resolveInfo="T" />
+        </node>
+      </node>
+      <node role="visibility" roleId="tpee.1178549979242" type="tpee.PublicVisibility" typeId="tpee.1146644602865" id="1357303818382343409" nodeInfo="nn" />
+      <node role="body" roleId="tpee.1068580123135" type="tpee.StatementList" typeId="tpee.1068580123136" id="1357303818382343410" nodeInfo="sn" />
+    </node>
+    <node role="member" roleId="tpee.5375687026011219971" type="tpee.PlaceholderMember" typeId="tpee.1465982738277781862" id="1357303818382343753" nodeInfo="ngu" />
+    <node role="visibility" roleId="tpee.1178549979242" type="tpee.PublicVisibility" typeId="tpee.1146644602865" id="1357303818382341942" nodeInfo="nn" />
+    <node role="extendedInterface" roleId="tpee.1107797138135" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818382662897" nodeInfo="in">
+      <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+    </node>
+    <node role="typeVariableDeclaration" roleId="tpee.1109279881614" type="tpee.TypeVariableDeclaration" typeId="tpee.1109279763828" id="1357303818382685611" nodeInfo="ng">
+      <property name="name" nameId="tpck.1169194664001" value="T" />
+      <node role="bound" roleId="tpee.1214996921760" type="tpee.ClassifierType" typeId="tpee.1107535904670" id="1357303818382690824" nodeInfo="in">
+        <link role="classifier" roleId="tpee.1107535924139" targetNodeId="jfki.~Node" resolveInfo="Node" />
+      </node>
+    </node>
+  </root>
 </model>