diff --git a/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.code.generics.mps b/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.code.generics.mps
index f8698364..3c8ff7d0 100644
--- a/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.code.generics.mps
+++ b/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.code.generics.mps
@@ -1605,6 +1605,19 @@
             <ref role="16sUi3" node="2PEDwPSdk9U" resolve="T" />
           </node>
         </node>
+        <node concept="3Tm1VV" id="4ObboSeq1Cm" role="1B3o_S" />
+      </node>
+      <node concept="3clFb_" id="4ObboSeq3Tj" role="jymVt">
+        <property role="TrG5h" value="get" />
+        <node concept="3clFbS" id="4ObboSeq3Tm" role="3clF47">
+          <node concept="3cpWs6" id="4ObboSeq28h" role="3cqZAp">
+            <node concept="10Nm6u" id="4ObboSeq28G" role="3cqZAk" />
+          </node>
+        </node>
+        <node concept="3Tm1VV" id="4ObboSeq3oD" role="1B3o_S" />
+        <node concept="16syzq" id="4ObboSeq3zZ" role="3clF45">
+          <ref role="16sUi3" node="2PEDwPSdk9U" resolve="T" />
+        </node>
       </node>
       <node concept="3Tm1VV" id="2PEDwPSdk9T" role="1B3o_S" />
       <node concept="16euLQ" id="2PEDwPSdk9U" role="16eVyc">
@@ -1659,158 +1672,371 @@
     <node concept="312cEu" id="2PEDwPSdka8" role="jymVt">
       <property role="TrG5h" value="Demo" />
       <node concept="2tJIrI" id="2VOKs1ArBqB" role="jymVt" />
-      <node concept="3clFb_" id="2PEDwPS8x7_" role="jymVt">
-        <property role="TrG5h" value="badCase" />
-        <node concept="37vLTG" id="2PEDwPS8xdk" role="3clF46">
-          <property role="TrG5h" value="elem" />
-          <node concept="16syzq" id="2PEDwPS8xeF" role="1tU5fm">
-            <ref role="16sUi3" node="2PEDwPS8xbC" resolve="T" />
-          </node>
-        </node>
-        <node concept="37vLTG" id="2PEDwPS8xge" role="3clF46">
-          <property role="TrG5h" value="ls" />
-          <node concept="3uibUv" id="2PEDwPS8xC2" role="1tU5fm">
-            <ref role="3uigEE" node="2PEDwPSdg4X" resolve="Containment.ForErrors2" />
-            <node concept="3uibUv" id="2PEDwPS8xGm" role="11_B2D">
-              <ref role="3uigEE" to="wyt6:~Double" resolve="Double" />
+      <node concept="1X3_iC" id="4ObboSeqkW_" role="lGtFl">
+        <property role="3V$3am" value="member" />
+        <property role="3V$3ak" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1107461130800/5375687026011219971" />
+        <node concept="3clFb_" id="2PEDwPS8x7_" role="8Wnug">
+          <property role="TrG5h" value="badCase" />
+          <node concept="37vLTG" id="2PEDwPS8xdk" role="3clF46">
+            <property role="TrG5h" value="elem" />
+            <node concept="16syzq" id="2PEDwPS8xeF" role="1tU5fm">
+              <ref role="16sUi3" node="2PEDwPS8xbC" resolve="T" />
             </node>
           </node>
-        </node>
-        <node concept="3clFbS" id="2PEDwPS8x7C" role="3clF47">
-          <node concept="3cpWs8" id="2PEDwPS8xJ5" role="3cqZAp">
-            <node concept="3cpWsn" id="2PEDwPS8xJ6" role="3cpWs9">
-              <property role="TrG5h" value="lsBad" />
-              <node concept="3uibUv" id="2PEDwPS8xO9" role="1tU5fm">
-                <ref role="3uigEE" node="2PEDwPSdg4X" resolve="Containment.ForErrors2" />
-                <node concept="16syzq" id="2PEDwPS8xYu" role="11_B2D">
-                  <ref role="16sUi3" node="2PEDwPS8xbC" resolve="T" />
+          <node concept="37vLTG" id="2PEDwPS8xge" role="3clF46">
+            <property role="TrG5h" value="ls" />
+            <node concept="3uibUv" id="2PEDwPS8xC2" role="1tU5fm">
+              <ref role="3uigEE" node="2PEDwPSdg4X" resolve="Containment.ForErrors2" />
+              <node concept="3uibUv" id="2PEDwPS8xGm" role="11_B2D">
+                <ref role="3uigEE" to="wyt6:~Double" resolve="Double" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbS" id="2PEDwPS8x7C" role="3clF47">
+            <node concept="3cpWs8" id="2PEDwPS8xJ5" role="3cqZAp">
+              <node concept="3cpWsn" id="2PEDwPS8xJ6" role="3cpWs9">
+                <property role="TrG5h" value="lsBad" />
+                <node concept="3uibUv" id="2PEDwPS8xO9" role="1tU5fm">
+                  <ref role="3uigEE" node="2PEDwPSdg4X" resolve="Containment.ForErrors2" />
+                  <node concept="16syzq" id="2PEDwPS8xYu" role="11_B2D">
+                    <ref role="16sUi3" node="2PEDwPS8xbC" resolve="T" />
+                  </node>
+                </node>
+                <node concept="37vLTw" id="2PEDwPS8y2m" role="33vP2m">
+                  <ref role="3cqZAo" node="2PEDwPS8xge" resolve="ls" />
+                </node>
+                <node concept="1U20sH" id="3mytCjZkuQY" role="lGtFl">
+                  <property role="1U20sK" value="error" />
                 </node>
               </node>
-              <node concept="37vLTw" id="2PEDwPS8y2m" role="33vP2m">
-                <ref role="3cqZAo" node="2PEDwPS8xge" resolve="ls" />
-              </node>
-              <node concept="1U20sH" id="3mytCjZkuQY" role="lGtFl">
-                <property role="1U20sK" value="error" />
-              </node>
             </node>
-          </node>
-          <node concept="3clFbF" id="2PEDwPS8yao" role="3cqZAp">
-            <node concept="2OqwBi" id="2PEDwPS8yfd" role="3clFbG">
-              <node concept="37vLTw" id="2PEDwPS8yam" role="2Oq$k0">
-                <ref role="3cqZAo" node="2PEDwPS8xJ6" resolve="lsBad" />
-              </node>
-              <node concept="liA8E" id="2PEDwPS8yiQ" role="2OqNvi">
-                <ref role="37wK5l" node="2PEDwPSdk9O" resolve="add" />
-                <node concept="37vLTw" id="2PEDwPS8y_D" role="37wK5m">
-                  <ref role="3cqZAo" node="2PEDwPS8xdk" resolve="elem" />
+            <node concept="3clFbF" id="2PEDwPS8yao" role="3cqZAp">
+              <node concept="2OqwBi" id="2PEDwPS8yfd" role="3clFbG">
+                <node concept="37vLTw" id="2PEDwPS8yam" role="2Oq$k0">
+                  <ref role="3cqZAo" node="2PEDwPS8xJ6" resolve="lsBad" />
+                </node>
+                <node concept="liA8E" id="2PEDwPS8yiQ" role="2OqNvi">
+                  <ref role="37wK5l" node="2PEDwPSdk9O" resolve="add" />
+                  <node concept="37vLTw" id="2PEDwPS8y_D" role="37wK5m">
+                    <ref role="3cqZAo" node="2PEDwPS8xdk" resolve="elem" />
+                  </node>
                 </node>
               </node>
             </node>
           </node>
-        </node>
-        <node concept="3Tm1VV" id="2PEDwPS8x51" role="1B3o_S" />
-        <node concept="3cqZAl" id="2PEDwPS8xax" role="3clF45" />
-        <node concept="16euLQ" id="2PEDwPS8xbC" role="16eVyc">
-          <property role="TrG5h" value="T" />
-          <node concept="3uibUv" id="2PEDwPS8ERk" role="3ztrMU">
-            <ref role="3uigEE" to="wyt6:~Number" resolve="Number" />
+          <node concept="3Tm1VV" id="2PEDwPS8x51" role="1B3o_S" />
+          <node concept="3cqZAl" id="2PEDwPS8xax" role="3clF45" />
+          <node concept="16euLQ" id="2PEDwPS8xbC" role="16eVyc">
+            <property role="TrG5h" value="T" />
+            <node concept="3uibUv" id="2PEDwPS8ERk" role="3ztrMU">
+              <ref role="3uigEE" to="wyt6:~Number" resolve="Number" />
+            </node>
           </node>
         </node>
       </node>
       <node concept="2tJIrI" id="1RiyfbgUCae" role="jymVt" />
-      <node concept="3clFb_" id="PltxfHwdmx" role="jymVt">
-        <property role="TrG5h" value="anotherExample" />
-        <node concept="37vLTG" id="PltxfHwdmA" role="3clF46">
-          <property role="TrG5h" value="e" />
-          <node concept="3uibUv" id="PltxfHwdmB" role="1tU5fm">
-            <ref role="3uigEE" node="2PEDwPSdka2" resolve="Containment.E" />
-            <node concept="3uibUv" id="PltxfHwdmC" role="11_B2D">
-              <ref role="3uigEE" to="wyt6:~Double" resolve="Double" />
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbS" id="PltxfHwdmD" role="3clF47">
-          <node concept="3clFbH" id="2PEDwPS8vba" role="3cqZAp" />
-          <node concept="3cpWs8" id="2PEDwPS8u6H" role="3cqZAp">
-            <node concept="3cpWsn" id="2PEDwPS8u6I" role="3cpWs9">
-              <property role="TrG5h" value="f" />
-              <node concept="3uibUv" id="2PEDwPS8u6J" role="1tU5fm">
+      <node concept="1X3_iC" id="4ObboSeqkyU" role="lGtFl">
+        <property role="3V$3am" value="member" />
+        <property role="3V$3ak" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1107461130800/5375687026011219971" />
+        <node concept="3clFb_" id="PltxfHwdmx" role="8Wnug">
+          <property role="TrG5h" value="anotherExample" />
+          <node concept="37vLTG" id="PltxfHwdmA" role="3clF46">
+            <property role="TrG5h" value="e" />
+            <node concept="3uibUv" id="PltxfHwdmB" role="1tU5fm">
+              <ref role="3uigEE" node="2PEDwPSdka2" resolve="Containment.E" />
+              <node concept="3uibUv" id="PltxfHwdmC" role="11_B2D">
                 <ref role="3uigEE" to="wyt6:~Double" resolve="Double" />
               </node>
-              <node concept="3b6qkQ" id="2PEDwPS8ufL" role="33vP2m">
-                <property role="$nhwW" value="1.23" />
-              </node>
             </node>
           </node>
-          <node concept="3cpWs8" id="2PEDwPS8ut5" role="3cqZAp">
-            <node concept="3cpWsn" id="2PEDwPS8ut8" role="3cpWs9">
-              <property role="TrG5h" value="basicError" />
-              <node concept="16syzq" id="2PEDwPS8utV" role="1tU5fm">
-                <ref role="16sUi3" node="2PEDwPS8uhk" resolve="SD" />
-              </node>
-              <node concept="37vLTw" id="2PEDwPS8uvt" role="33vP2m">
-                <ref role="3cqZAo" node="2PEDwPS8u6I" resolve="f" />
-              </node>
-              <node concept="1U20sH" id="2PEDwPSdeBx" role="lGtFl">
-                <property role="1U20sK" value="error" />
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbH" id="2PEDwPS8u$7" role="3cqZAp" />
-          <node concept="3cpWs8" id="2PEDwPS7RDf" role="3cqZAp">
-            <node concept="3cpWsn" id="2PEDwPS7RDg" role="3cpWs9">
-              <property role="TrG5h" value="resErr1" />
-              <node concept="3uibUv" id="2PEDwPS7RDn" role="1tU5fm">
-                <ref role="3uigEE" node="2PEDwPSdk9W" resolve="Containment.ForErrors1" />
-                <node concept="16syzq" id="2PEDwPS7S6T" role="11_B2D">
-                  <ref role="16sUi3" node="PltxfHwdmQ" resolve="S" />
+          <node concept="3clFbS" id="PltxfHwdmD" role="3clF47">
+            <node concept="3clFbH" id="2PEDwPS8vba" role="3cqZAp" />
+            <node concept="3cpWs8" id="2PEDwPS8u6H" role="3cqZAp">
+              <node concept="3cpWsn" id="2PEDwPS8u6I" role="3cpWs9">
+                <property role="TrG5h" value="f" />
+                <node concept="3uibUv" id="2PEDwPS8u6J" role="1tU5fm">
+                  <ref role="3uigEE" to="wyt6:~Double" resolve="Double" />
+                </node>
+                <node concept="3b6qkQ" id="2PEDwPS8ufL" role="33vP2m">
+                  <property role="$nhwW" value="1.23" />
                 </node>
               </node>
-              <node concept="37vLTw" id="2PEDwPS8dMR" role="33vP2m">
-                <ref role="3cqZAo" node="PltxfHwdmA" resolve="e" />
-              </node>
-              <node concept="1U20sH" id="3mytCjZkw$A" role="lGtFl">
-                <property role="1U20sK" value="error" />
+            </node>
+            <node concept="3cpWs8" id="2PEDwPS8ut5" role="3cqZAp">
+              <node concept="3cpWsn" id="2PEDwPS8ut8" role="3cpWs9">
+                <property role="TrG5h" value="basicError" />
+                <node concept="16syzq" id="2PEDwPS8utV" role="1tU5fm">
+                  <ref role="16sUi3" node="2PEDwPS8uhk" resolve="SD" />
+                </node>
+                <node concept="37vLTw" id="2PEDwPS8uvt" role="33vP2m">
+                  <ref role="3cqZAo" node="2PEDwPS8u6I" resolve="f" />
+                </node>
+                <node concept="1U20sH" id="2PEDwPSdeBx" role="lGtFl">
+                  <property role="1U20sK" value="error" />
+                </node>
               </node>
             </node>
-          </node>
-          <node concept="3cpWs8" id="2PEDwPS8g60" role="3cqZAp">
-            <node concept="3cpWsn" id="2PEDwPS8g61" role="3cpWs9">
-              <property role="TrG5h" value="resOk" />
-              <node concept="3uibUv" id="2PEDwPS8g62" role="1tU5fm">
-                <ref role="3uigEE" node="2PEDwPSdka2" resolve="Containment.E" />
-                <node concept="3qUE_q" id="2PEDwPS8lry" role="11_B2D">
-                  <node concept="3uibUv" id="2PEDwPS8ggV" role="3qUE_r">
-                    <ref role="3uigEE" to="wyt6:~Comparable" resolve="Comparable" />
-                    <node concept="3qTvmN" id="2PEDwPS8gql" role="11_B2D" />
+            <node concept="3clFbH" id="2PEDwPS8u$7" role="3cqZAp" />
+            <node concept="3cpWs8" id="2PEDwPS7RDf" role="3cqZAp">
+              <node concept="3cpWsn" id="2PEDwPS7RDg" role="3cpWs9">
+                <property role="TrG5h" value="resErr1" />
+                <node concept="3uibUv" id="2PEDwPS7RDn" role="1tU5fm">
+                  <ref role="3uigEE" node="2PEDwPSdk9W" resolve="Containment.ForErrors1" />
+                  <node concept="16syzq" id="2PEDwPS7S6T" role="11_B2D">
+                    <ref role="16sUi3" node="PltxfHwdmQ" resolve="S" />
                   </node>
                 </node>
+                <node concept="37vLTw" id="2PEDwPS8dMR" role="33vP2m">
+                  <ref role="3cqZAo" node="PltxfHwdmA" resolve="e" />
+                </node>
+                <node concept="1U20sH" id="3mytCjZkw$A" role="lGtFl">
+                  <property role="1U20sK" value="error" />
+                </node>
               </node>
-              <node concept="37vLTw" id="2PEDwPS8g64" role="33vP2m">
-                <ref role="3cqZAo" node="PltxfHwdmA" resolve="e" />
+            </node>
+            <node concept="3cpWs8" id="2PEDwPS8g60" role="3cqZAp">
+              <node concept="3cpWsn" id="2PEDwPS8g61" role="3cpWs9">
+                <property role="TrG5h" value="resOk" />
+                <node concept="3uibUv" id="2PEDwPS8g62" role="1tU5fm">
+                  <ref role="3uigEE" node="2PEDwPSdka2" resolve="Containment.E" />
+                  <node concept="3qUE_q" id="2PEDwPS8lry" role="11_B2D">
+                    <node concept="3uibUv" id="2PEDwPS8ggV" role="3qUE_r">
+                      <ref role="3uigEE" to="wyt6:~Comparable" resolve="Comparable" />
+                      <node concept="3qTvmN" id="2PEDwPS8gql" role="11_B2D" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="37vLTw" id="2PEDwPS8g64" role="33vP2m">
+                  <ref role="3cqZAo" node="PltxfHwdmA" resolve="e" />
+                </node>
               </node>
             </node>
           </node>
-        </node>
-        <node concept="3Tm1VV" id="PltxfHwdmO" role="1B3o_S" />
-        <node concept="3cqZAl" id="PltxfHwdmP" role="3clF45" />
-        <node concept="16euLQ" id="PltxfHwdmQ" role="16eVyc">
-          <property role="TrG5h" value="S" />
-          <node concept="3uibUv" id="PltxfHwdmS" role="3ztrMU">
-            <ref role="3uigEE" to="wyt6:~Comparable" resolve="Comparable" />
-            <node concept="3qTvmN" id="PltxfHwdmT" role="11_B2D" />
+          <node concept="3Tm1VV" id="PltxfHwdmO" role="1B3o_S" />
+          <node concept="3cqZAl" id="PltxfHwdmP" role="3clF45" />
+          <node concept="16euLQ" id="PltxfHwdmQ" role="16eVyc">
+            <property role="TrG5h" value="S" />
+            <node concept="3uibUv" id="PltxfHwdmS" role="3ztrMU">
+              <ref role="3uigEE" to="wyt6:~Comparable" resolve="Comparable" />
+              <node concept="3qTvmN" id="PltxfHwdmT" role="11_B2D" />
+            </node>
           </node>
-        </node>
-        <node concept="16euLQ" id="2PEDwPS8uhk" role="16eVyc">
-          <property role="TrG5h" value="SD" />
-          <node concept="3uibUv" id="2PEDwPS8upi" role="3ztrMU">
-            <ref role="3uigEE" to="wyt6:~Comparable" resolve="Comparable" />
-            <node concept="3uibUv" id="2PEDwPS8usY" role="11_B2D">
-              <ref role="3uigEE" to="wyt6:~Double" resolve="Double" />
+          <node concept="16euLQ" id="2PEDwPS8uhk" role="16eVyc">
+            <property role="TrG5h" value="SD" />
+            <node concept="3uibUv" id="2PEDwPS8upi" role="3ztrMU">
+              <ref role="3uigEE" to="wyt6:~Comparable" resolve="Comparable" />
+              <node concept="3uibUv" id="2PEDwPS8usY" role="11_B2D">
+                <ref role="3uigEE" to="wyt6:~Double" resolve="Double" />
+              </node>
             </node>
           </node>
         </node>
       </node>
+      <node concept="2tJIrI" id="4ObboSepNwS" role="jymVt" />
+      <node concept="3clFb_" id="4ObboSepPaS" role="jymVt">
+        <property role="TrG5h" value="captures1" />
+        <node concept="37vLTG" id="4ObboSepQw8" role="3clF46">
+          <property role="TrG5h" value="e1" />
+          <node concept="3uibUv" id="4ObboSepSqH" role="1tU5fm">
+            <ref role="3uigEE" node="2PEDwPSdka2" resolve="Containment.E" />
+            <node concept="3qTvmN" id="4ObboSepSKf" role="11_B2D" />
+          </node>
+        </node>
+        <node concept="37vLTG" id="4ObboSepUH5" role="3clF46">
+          <property role="TrG5h" value="e2" />
+          <node concept="3uibUv" id="4ObboSepVmM" role="1tU5fm">
+            <ref role="3uigEE" node="2PEDwPSdka2" resolve="Containment.E" />
+            <node concept="3qTvmN" id="4ObboSepVo5" role="11_B2D" />
+          </node>
+        </node>
+        <node concept="3clFbS" id="4ObboSepPaV" role="3clF47">
+          <node concept="3clFbF" id="4ObboSepW2t" role="3cqZAp">
+            <node concept="37vLTI" id="4ObboSepWsM" role="3clFbG">
+              <node concept="37vLTw" id="4ObboSepWMs" role="37vLTx">
+                <ref role="3cqZAo" node="4ObboSepUH5" resolve="e2" />
+              </node>
+              <node concept="37vLTw" id="4ObboSepW2s" role="37vLTJ">
+                <ref role="3cqZAo" node="4ObboSepQw8" resolve="e1" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="4ObboSeq5iX" role="3cqZAp">
+            <node concept="2OqwBi" id="4ObboSeq5os" role="3clFbG">
+              <node concept="37vLTw" id="4ObboSeq5iV" role="2Oq$k0">
+                <ref role="3cqZAo" node="4ObboSepQw8" resolve="e1" />
+              </node>
+              <node concept="liA8E" id="4ObboSeq5NL" role="2OqNvi">
+                <ref role="37wK5l" node="2PEDwPSdk9O" resolve="add" />
+                <node concept="2OqwBi" id="4ObboSeq6m2" role="37wK5m">
+                  <node concept="37vLTw" id="4ObboSeq6be" role="2Oq$k0">
+                    <ref role="3cqZAo" node="4ObboSepUH5" resolve="e2" />
+                  </node>
+                  <node concept="liA8E" id="4ObboSeq6pg" role="2OqNvi">
+                    <ref role="37wK5l" node="4ObboSeq3Tj" resolve="get" />
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