diff --git a/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.incremental@tests.mps b/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.incremental@tests.mps
index 45750365..143bd249 100644
--- a/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.incremental@tests.mps
+++ b/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.incremental@tests.mps
@@ -116,11 +116,13 @@
       </concept>
       <concept id="1068390468200" name="jetbrains.mps.baseLanguage.structure.FieldDeclaration" flags="ig" index="312cEg" />
       <concept id="1068390468198" name="jetbrains.mps.baseLanguage.structure.ClassConcept" flags="ig" index="312cEu">
+        <child id="1095933932569" name="implementedInterface" index="EKbjA" />
         <child id="1165602531693" name="superclass" index="1zkMxy" />
       </concept>
       <concept id="1068431474542" name="jetbrains.mps.baseLanguage.structure.VariableDeclaration" flags="ng" index="33uBYm">
         <child id="1068431790190" name="initializer" index="33vP2m" />
       </concept>
+      <concept id="1068431790189" name="jetbrains.mps.baseLanguage.structure.Type" flags="in" index="33vP2l" />
       <concept id="1068431790191" name="jetbrains.mps.baseLanguage.structure.Expression" flags="nn" index="33vP2n" />
       <concept id="1109279763828" name="jetbrains.mps.baseLanguage.structure.TypeVariableDeclaration" flags="ng" index="16euLQ">
         <child id="1214996921760" name="bound" index="3ztrMU" />
@@ -218,6 +220,7 @@
       <concept id="1144230876926" name="jetbrains.mps.baseLanguage.structure.AbstractForStatement" flags="nn" index="1DupvO">
         <child id="1144230900587" name="variable" index="1Duv9x" />
       </concept>
+      <concept id="1107796713796" name="jetbrains.mps.baseLanguage.structure.Interface" flags="ig" index="3HP615" />
       <concept id="6329021646629104954" name="jetbrains.mps.baseLanguage.structure.SingleLineComment" flags="nn" index="3SKdUt">
         <child id="1350122676458893092" name="text" index="3ndbpf" />
       </concept>
@@ -250,6 +253,10 @@
       </concept>
     </language>
     <language id="3a13115c-633c-4c5c-bbcc-75c4219e9555" name="jetbrains.mps.lang.quotation">
+      <concept id="1196350785110" name="jetbrains.mps.lang.quotation.structure.AbstractAntiquotation" flags="ng" index="2c44t0">
+        <child id="1196350785111" name="expression" index="2c44t1" />
+      </concept>
+      <concept id="1196350785112" name="jetbrains.mps.lang.quotation.structure.Antiquotation" flags="ng" index="2c44te" />
       <concept id="1196350785113" name="jetbrains.mps.lang.quotation.structure.Quotation" flags="nn" index="2c44tf">
         <child id="1196350785114" name="quotedNode" index="2c44tc" />
       </concept>
@@ -377,6 +384,7 @@
         <child id="1197683475734" name="valueType" index="3rvSg0" />
       </concept>
       <concept id="1165525191778" name="jetbrains.mps.baseLanguage.collections.structure.GetFirstOperation" flags="nn" index="1uHKPH" />
+      <concept id="1165530316231" name="jetbrains.mps.baseLanguage.collections.structure.IsEmptyOperation" flags="nn" index="1v1jN8" />
       <concept id="7125221305512719026" name="jetbrains.mps.baseLanguage.collections.structure.CollectionType" flags="in" index="3vKaQO" />
       <concept id="1165595910856" name="jetbrains.mps.baseLanguage.collections.structure.GetLastOperation" flags="nn" index="1yVyf7" />
       <concept id="1202120902084" name="jetbrains.mps.baseLanguage.collections.structure.WhereOperation" flags="nn" index="3zZkjj" />
@@ -2934,6 +2942,86 @@
         </node>
       </node>
     </node>
+    <node concept="1qefOq" id="Na4AEA7p$T" role="1SKRRt">
+      <node concept="312cEu" id="1sJZ0_oXh9Q" role="1qenE9">
+        <property role="TrG5h" value="DemoInterfaces" />
+        <node concept="2tJIrI" id="Na4AEA6v6g" role="jymVt" />
+        <node concept="3HP615" id="Na4AEA6ER2" role="jymVt">
+          <property role="2bfB8j" value="true" />
+          <property role="TrG5h" value="IBox1" />
+          <node concept="3Tm1VV" id="Na4AEA6Em9" role="1B3o_S" />
+          <node concept="16euLQ" id="Na4AEA6FMW" role="16eVyc">
+            <property role="TrG5h" value="T1" />
+            <node concept="3uibUv" id="Na4AEA6Hsy" role="3ztrMU">
+              <ref role="3uigEE" to="wyt6:~Number" resolve="Number" />
+            </node>
+          </node>
+          <node concept="3xLA65" id="Na4AEA8gQl" role="lGtFl">
+            <property role="TrG5h" value="clsIBox1" />
+          </node>
+        </node>
+        <node concept="3HP615" id="Na4AEA6Jps" role="jymVt">
+          <property role="2bfB8j" value="true" />
+          <property role="TrG5h" value="IBox2" />
+          <node concept="3Tm1VV" id="Na4AEA6Jpt" role="1B3o_S" />
+          <node concept="16euLQ" id="Na4AEA6Jpu" role="16eVyc">
+            <property role="TrG5h" value="T2" />
+            <node concept="3uibUv" id="Na4AEA6KKe" role="3ztrMU">
+              <ref role="3uigEE" to="wyt6:~Integer" resolve="Integer" />
+            </node>
+          </node>
+          <node concept="3xLA65" id="Na4AEA8iUy" role="lGtFl">
+            <property role="TrG5h" value="clsIBox2" />
+          </node>
+        </node>
+        <node concept="2tJIrI" id="Na4AEA7QY0" role="jymVt" />
+        <node concept="312cEu" id="Na4AEA7Rqo" role="jymVt">
+          <property role="2bfB8j" value="true" />
+          <property role="TrG5h" value="Dummy" />
+          <node concept="3Tm1VV" id="Na4AEA7Rp$" role="1B3o_S" />
+          <node concept="16euLQ" id="Na4AEA7SfQ" role="16eVyc">
+            <property role="TrG5h" value="S0" />
+            <node concept="3uibUv" id="Na4AEA824A" role="3ztrMU">
+              <ref role="3uigEE" to="wyt6:~Integer" resolve="Integer" />
+            </node>
+          </node>
+          <node concept="3uibUv" id="Na4AEA82Tz" role="EKbjA">
+            <ref role="3uigEE" node="Na4AEA6Jps" resolve="DemoInterfaces.IBox2" />
+            <node concept="16syzq" id="Na4AEA8cJx" role="11_B2D">
+              <ref role="16sUi3" node="Na4AEA7SfQ" resolve="S0" />
+            </node>
+          </node>
+        </node>
+        <node concept="2tJIrI" id="Na4AEA6CAP" role="jymVt" />
+        <node concept="312cEu" id="Na4AEA6w22" role="jymVt">
+          <property role="2bfB8j" value="true" />
+          <property role="TrG5h" value="Box3" />
+          <node concept="3Tm1VV" id="Na4AEA6vYr" role="1B3o_S" />
+          <node concept="16euLQ" id="Na4AEA6yzD" role="16eVyc">
+            <property role="TrG5h" value="S" />
+            <node concept="3uibUv" id="Na4AEA6zN7" role="3ztrMU">
+              <ref role="3uigEE" to="wyt6:~Number" resolve="Number" />
+            </node>
+          </node>
+          <node concept="3uibUv" id="Na4AEA6_vU" role="EKbjA">
+            <ref role="3uigEE" node="Na4AEA6ER2" resolve="DemoInterfaces.IBox1" />
+            <node concept="16syzq" id="Na4AEA6MWZ" role="11_B2D">
+              <ref role="16sUi3" node="Na4AEA6yzD" resolve="S" />
+              <node concept="3xLA65" id="Na4AEA86cH" role="lGtFl">
+                <property role="TrG5h" value="boxTvSubst" />
+              </node>
+            </node>
+          </node>
+          <node concept="3xLA65" id="Na4AEA7D2k" role="lGtFl">
+            <property role="TrG5h" value="clsBox3" />
+          </node>
+        </node>
+        <node concept="3Tm1VV" id="1sJZ0_oXha5" role="1B3o_S" />
+        <node concept="3xLA65" id="Na4AEA7LDm" role="lGtFl">
+          <property role="TrG5h" value="demoBounds3" />
+        </node>
+      </node>
+    </node>
     <node concept="1LZb2c" id="3vh3iHvq6qg" role="1SL9yI">
       <property role="TrG5h" value="replaceSingleNode" />
       <node concept="3cqZAl" id="3vh3iHvq6qh" role="3clF45" />
@@ -5899,6 +5987,374 @@
         </node>
       </node>
     </node>
+    <node concept="1LZb2c" id="Na4AEA8mcF" role="1SL9yI">
+      <property role="TrG5h" value="subtyping_replaceTypeParam_inClassifier" />
+      <node concept="3cqZAl" id="Na4AEA8mcG" role="3clF45" />
+      <node concept="3clFbS" id="Na4AEA8mcH" role="3clF47">
+        <node concept="3cpWs8" id="Na4AEA8mcI" role="3cqZAp">
+          <node concept="3cpWsn" id="Na4AEA8mcJ" role="3cpWs9">
+            <property role="TrG5h" value="typecheckRoot" />
+            <node concept="3Tqbb2" id="Na4AEA8mcK" role="1tU5fm" />
+            <node concept="3xONca" id="Na4AEA8_eH" role="33vP2m">
+              <ref role="3xOPvv" node="Na4AEA7LDm" resolve="demoBounds3" />
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs8" id="Na4AEA8mcM" role="3cqZAp">
+          <node concept="3cpWsn" id="Na4AEA8mcN" role="3cpWs9">
+            <property role="TrG5h" value="testNode" />
+            <node concept="3Tqbb2" id="Na4AEA8mcO" role="1tU5fm">
+              <ref role="ehGHo" to="tpee:g96syBo" resolve="TypeVariableReference" />
+            </node>
+            <node concept="3xONca" id="Na4AEA8CiC" role="33vP2m">
+              <ref role="3xOPvv" node="Na4AEA86cH" resolve="boxTvSubst" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="Na4AEA8mcQ" role="3cqZAp" />
+        <node concept="3cpWs8" id="Na4AEA8mcR" role="3cqZAp">
+          <node concept="3cpWsn" id="Na4AEA8mcS" role="3cpWs9">
+            <property role="TrG5h" value="launcher" />
+            <node concept="3uibUv" id="Na4AEA8mcT" role="1tU5fm">
+              <ref role="3uigEE" to="hfva:tyIfzC0ZNj" resolve="IncrementalLaunchHelper" />
+            </node>
+            <node concept="2YIFZM" id="Na4AEA8mcU" role="33vP2m">
+              <ref role="37wK5l" to="hfva:2FNFm8neYtH" resolve="getLauncher" />
+              <ref role="1Pybhc" to="hfva:tyIfzC0ZNj" resolve="IncrementalLaunchHelper" />
+              <node concept="37vLTw" id="Na4AEA8mcV" role="37wK5m">
+                <ref role="3cqZAo" node="Na4AEA8mcJ" resolve="typecheckRoot" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="Na4AEA8mcW" role="3cqZAp" />
+        <node concept="3cpWs8" id="Na4AEA8mcX" role="3cqZAp">
+          <node concept="3cpWsn" id="Na4AEA8mcY" role="3cpWs9">
+            <property role="TrG5h" value="testNodeRef" />
+            <node concept="3uibUv" id="Na4AEA8mcZ" role="1tU5fm">
+              <ref role="3uigEE" to="mhbf:~SNodeReference" resolve="SNodeReference" />
+            </node>
+            <node concept="2OqwBi" id="Na4AEA8md0" role="33vP2m">
+              <node concept="liA8E" id="Na4AEA8md1" role="2OqNvi">
+                <ref role="37wK5l" to="mhbf:~SNode.getReference()" resolve="getReference" />
+              </node>
+              <node concept="2JrnkZ" id="Na4AEA8md2" role="2Oq$k0">
+                <node concept="37vLTw" id="Na4AEA8md3" role="2JrQYb">
+                  <ref role="3cqZAo" node="Na4AEA8mcN" resolve="testNode" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs8" id="Na4AEA8md4" role="3cqZAp">
+          <node concept="3cpWsn" id="Na4AEA8md5" role="3cpWs9">
+            <property role="TrG5h" value="types0" />
+            <node concept="3rvAFt" id="Na4AEA8md6" role="1tU5fm">
+              <node concept="3uibUv" id="Na4AEA8md7" role="3rvQeY">
+                <ref role="3uigEE" to="mhbf:~SNodeReference" resolve="SNodeReference" />
+              </node>
+              <node concept="3Tqbb2" id="Na4AEA8md8" role="3rvSg0" />
+            </node>
+            <node concept="2OqwBi" id="Na4AEA8md9" role="33vP2m">
+              <node concept="liA8E" id="Na4AEA8mda" role="2OqNvi">
+                <ref role="37wK5l" to="hfva:2u_o41fICWA" resolve="launch" />
+                <node concept="37vLTw" id="Na4AEA8mdb" role="37wK5m">
+                  <ref role="3cqZAo" node="Na4AEA8mcJ" resolve="typecheckRoot" />
+                </node>
+              </node>
+              <node concept="37vLTw" id="Na4AEA8mdc" role="2Oq$k0">
+                <ref role="3cqZAo" node="Na4AEA8mcS" resolve="launcher" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="Na4AEA8mdd" role="3cqZAp">
+          <node concept="2YIFZM" id="Na4AEA8mde" role="3clFbG">
+            <ref role="1Pybhc" to="hfva:3evPR3EeeoU" resolve="TestInfoPrinter" />
+            <ref role="37wK5l" to="hfva:3o9wrC3D5cI" resolve="printInfo" />
+            <node concept="37vLTw" id="Na4AEA8mdf" role="37wK5m">
+              <ref role="3cqZAo" node="Na4AEA8mcS" resolve="launcher" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="Na4AEA8mdg" role="3cqZAp" />
+        <node concept="1X3_iC" id="Na4AEAbA0m" role="lGtFl">
+          <property role="3V$3am" value="statement" />
+          <property role="3V$3ak" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1068580123136/1068581517665" />
+          <node concept="3vwNmj" id="Na4AEA8mdh" role="8Wnug">
+            <node concept="2OqwBi" id="Na4AEA8mdi" role="3vwVQn">
+              <node concept="37vLTw" id="Na4AEA8mdj" role="2Oq$k0">
+                <ref role="3cqZAo" node="Na4AEA8md5" resolve="types0" />
+              </node>
+              <node concept="2Nt0df" id="Na4AEA8mdk" role="2OqNvi">
+                <node concept="37vLTw" id="Na4AEA8mdl" role="38cxEo">
+                  <ref role="3cqZAo" node="Na4AEA8mcY" resolve="testNodeRef" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3vwNmj" id="Na4AEAcBk6" role="3cqZAp">
+          <node concept="2OqwBi" id="Na4AEAb_Ex" role="3vwVQn">
+            <node concept="2OqwBi" id="Na4AEAb_Ey" role="2Oq$k0">
+              <node concept="37vLTw" id="Na4AEAb_Ez" role="2Oq$k0">
+                <ref role="3cqZAo" node="Na4AEA8mcS" resolve="launcher" />
+              </node>
+              <node concept="liA8E" id="Na4AEAb_E$" role="2OqNvi">
+                <ref role="37wK5l" to="hfva:3o9wrC3y$h_" resolve="getFailedNodes" />
+              </node>
+            </node>
+            <node concept="1v1jN8" id="Na4AEAc_U9" role="2OqNvi" />
+          </node>
+        </node>
+        <node concept="3clFbH" id="Na4AEA8mdv" role="3cqZAp" />
+        <node concept="3cpWs8" id="Na4AEA9qFK" role="3cqZAp">
+          <node concept="3cpWsn" id="Na4AEA9qFN" role="3cpWs9">
+            <property role="TrG5h" value="implemented1" />
+            <node concept="3Tqbb2" id="Na4AEA9qFI" role="1tU5fm">
+              <ref role="ehGHo" to="tpee:g7uibYu" resolve="ClassifierType" />
+            </node>
+            <node concept="2OqwBi" id="Na4AEA9C7T" role="33vP2m">
+              <node concept="2OqwBi" id="Na4AEA9zZH" role="2Oq$k0">
+                <node concept="2OqwBi" id="Na4AEA9wsg" role="2Oq$k0">
+                  <node concept="3xONca" id="Na4AEA9w9D" role="2Oq$k0">
+                    <ref role="3xOPvv" node="Na4AEA7D2k" resolve="clsBox3" />
+                  </node>
+                  <node concept="3Tsc0h" id="Na4AEA9wXo" role="2OqNvi">
+                    <ref role="3TtcxE" to="tpee:fWEKbgp" resolve="implementedInterface" />
+                  </node>
+                </node>
+                <node concept="1uHKPH" id="Na4AEA9BzZ" role="2OqNvi" />
+              </node>
+              <node concept="1$rogu" id="Na4AEA9CVn" role="2OqNvi" />
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs8" id="Na4AEA8UvB" role="3cqZAp">
+          <node concept="3cpWsn" id="Na4AEA8UvE" role="3cpWs9">
+            <property role="TrG5h" value="implemented2" />
+            <node concept="3Tqbb2" id="Na4AEA8Uv_" role="1tU5fm">
+              <ref role="ehGHo" to="tpee:g7uibYu" resolve="ClassifierType" />
+            </node>
+            <node concept="2c44tf" id="Na4AEA9aHQ" role="33vP2m">
+              <node concept="3uibUv" id="Na4AEA9b9P" role="2c44tc">
+                <ref role="3uigEE" node="Na4AEA6Jps" resolve="DemoInterfaces.IBox2" />
+                <node concept="33vP2l" id="Na4AEAbEq3" role="11_B2D">
+                  <node concept="2c44te" id="Na4AEAbEvR" role="lGtFl">
+                    <node concept="37vLTw" id="Na4AEAbEw6" role="2c44t1">
+                      <ref role="3cqZAo" node="Na4AEA8mcN" resolve="testNode" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="1X3_iC" id="Na4AEAbEP4" role="lGtFl">
+          <property role="3V$3am" value="statement" />
+          <property role="3V$3ak" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1068580123136/1068581517665" />
+          <node concept="3clFbF" id="Na4AEAbDVK" role="8Wnug">
+            <node concept="2OqwBi" id="Na4AEAbCOp" role="3clFbG">
+              <node concept="2OqwBi" id="Na4AEAa550" role="2Oq$k0">
+                <node concept="2OqwBi" id="Na4AEAa1CO" role="2Oq$k0">
+                  <node concept="37vLTw" id="Na4AEAa13n" role="2Oq$k0">
+                    <ref role="3cqZAo" node="Na4AEA8UvE" resolve="implemented2" />
+                  </node>
+                  <node concept="3Tsc0h" id="Na4AEAa34t" role="2OqNvi">
+                    <ref role="3TtcxE" to="tpee:g91_B6F" resolve="parameter" />
+                  </node>
+                </node>
+                <node concept="1uHKPH" id="Na4AEAa7pI" role="2OqNvi" />
+              </node>
+              <node concept="1P9Npp" id="Na4AEAbDdn" role="2OqNvi">
+                <node concept="37vLTw" id="Na4AEAbDhU" role="1P9ThW">
+                  <ref role="3cqZAo" node="Na4AEA8mcN" resolve="testNode" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="Na4AEA9GlL" role="3cqZAp" />
+        <node concept="3clFbF" id="Na4AEAbvV7" role="3cqZAp">
+          <node concept="2OqwBi" id="Na4AEAbzxl" role="3clFbG">
+            <node concept="2OqwBi" id="Na4AEA8mdD" role="2Oq$k0">
+              <node concept="2OqwBi" id="Na4AEA8mdE" role="2Oq$k0">
+                <node concept="3xONca" id="Na4AEA8O0M" role="2Oq$k0">
+                  <ref role="3xOPvv" node="Na4AEA7D2k" resolve="clsBox3" />
+                </node>
+                <node concept="3Tsc0h" id="Na4AEA8QaE" role="2OqNvi">
+                  <ref role="3TtcxE" to="tpee:fWEKbgp" resolve="implementedInterface" />
+                </node>
+              </node>
+              <node concept="1uHKPH" id="Na4AEA8mdH" role="2OqNvi" />
+            </node>
+            <node concept="1P9Npp" id="Na4AEAbzWw" role="2OqNvi">
+              <node concept="37vLTw" id="Na4AEAbzY$" role="1P9ThW">
+                <ref role="3cqZAo" node="Na4AEA8UvE" resolve="implemented2" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs8" id="Na4AEAbutv" role="3cqZAp">
+          <node concept="3cpWsn" id="Na4AEAbutw" role="3cpWs9">
+            <property role="TrG5h" value="typesDelta1" />
+            <node concept="2OqwBi" id="Na4AEAbutx" role="33vP2m">
+              <node concept="37vLTw" id="Na4AEAbuty" role="2Oq$k0">
+                <ref role="3cqZAo" node="Na4AEA8mcS" resolve="launcher" />
+              </node>
+              <node concept="liA8E" id="Na4AEAbutz" role="2OqNvi">
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