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 cdb2a964..25869172 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
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<model ref="r:3be3464b-7052-4e73-b8e9-dc5802b8d5a9(jetbrains.mps.baseLanguageExt.test.code.generics)" doNotGenerate="true">
+<model ref="r:3be3464b-7052-4e73-b8e9-dc5802b8d5a9(jetbrains.mps.baseLanguageExt.test.code.generics)">
   <persistence version="9" />
   <languages>
     <use id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage" version="9" />
@@ -3501,8 +3501,117 @@
     <node concept="312cEu" id="1TH_SRmEWGi" role="jymVt">
       <property role="2bfB8j" value="true" />
       <property role="TrG5h" value="G" />
+      <node concept="3clFb_" id="1TH_SRmEWGH" role="jymVt">
+        <property role="TrG5h" value="g0" />
+        <node concept="37vLTG" id="1TH_SRmEWGI" role="3clF46">
+          <property role="TrG5h" value="h" />
+          <node concept="3uibUv" id="1TH_SRmEWGJ" role="1tU5fm">
+            <ref role="3uigEE" node="1TH_SRmEWG9" resolve="Bounds.H" />
+            <node concept="16syzq" id="1TH_SRmEWGK" role="11_B2D">
+              <ref role="16sUi3" node="1TH_SRmEWGQ" resolve="S" />
+            </node>
+          </node>
+        </node>
+        <node concept="16syzq" id="1TH_SRmEWGL" role="3clF45">
+          <ref role="16sUi3" node="1TH_SRmEWGP" resolve="T3" />
+        </node>
+        <node concept="3clFbS" id="1TH_SRmEWGM" role="3clF47">
+          <node concept="3clFbF" id="1TH_SRmEWGN" role="3cqZAp">
+            <node concept="10Nm6u" id="1TH_SRmEWGO" role="3clFbG" />
+          </node>
+        </node>
+        <node concept="16euLQ" id="1TH_SRmEWGP" role="16eVyc">
+          <property role="TrG5h" value="T3" />
+        </node>
+        <node concept="16euLQ" id="1TH_SRmEWGQ" role="16eVyc">
+          <property role="TrG5h" value="S" />
+          <node concept="3uibUv" id="1TH_SRmEWGR" role="3ztrMU">
+            <ref role="3uigEE" node="1TH_SRmEWFS" resolve="Bounds.J" />
+            <node concept="3qUtgH" id="1TH_SRmEWGS" role="11_B2D">
+              <node concept="16syzq" id="1TH_SRmEWGT" role="3qUvdb">
+                <ref role="16sUi3" node="1TH_SRmEWGP" resolve="T3" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3clFb_" id="5o9$c3zKs5N" role="jymVt">
+        <property role="TrG5h" value="gA" />
+        <node concept="37vLTG" id="5o9$c3zKs5O" role="3clF46">
+          <property role="TrG5h" value="h" />
+          <node concept="3uibUv" id="5o9$c3zLgPu" role="1tU5fm">
+            <ref role="3uigEE" node="1TH_SRmEWG9" resolve="Bounds.H" />
+            <node concept="16syzq" id="5o9$c3zLhLr" role="11_B2D">
+              <ref role="16sUi3" node="5o9$c3zLbJ7" resolve="S" />
+            </node>
+          </node>
+        </node>
+        <node concept="16syzq" id="5o9$c3zKs5T" role="3clF45">
+          <ref role="16sUi3" node="5o9$c3zKs5X" resolve="T4" />
+        </node>
+        <node concept="3clFbS" id="5o9$c3zKs5U" role="3clF47">
+          <node concept="3clFbF" id="5o9$c3zKs5V" role="3cqZAp">
+            <node concept="10Nm6u" id="5o9$c3zKs5W" role="3clFbG" />
+          </node>
+        </node>
+        <node concept="16euLQ" id="5o9$c3zKs5X" role="16eVyc">
+          <property role="TrG5h" value="T4" />
+          <node concept="3uibUv" id="5o9$c3zKs5Y" role="3ztrMU">
+            <ref role="3uigEE" node="1TH_SRmEWFB" resolve="Bounds.A" />
+          </node>
+        </node>
+        <node concept="16euLQ" id="5o9$c3zLbJ7" role="16eVyc">
+          <property role="TrG5h" value="S" />
+          <node concept="3uibUv" id="5o9$c3zLbJ8" role="3ztrMU">
+            <ref role="3uigEE" node="1TH_SRmEWFS" resolve="Bounds.J" />
+            <node concept="3qUtgH" id="5o9$c3zLbJ9" role="11_B2D">
+              <node concept="16syzq" id="5o9$c3zLkPt" role="3qUvdb">
+                <ref role="16sUi3" node="5o9$c3zKs5X" resolve="T4" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3clFb_" id="1TH_SRmEWGv" role="jymVt">
+        <property role="TrG5h" value="gB" />
+        <node concept="37vLTG" id="1TH_SRmEWGw" role="3clF46">
+          <property role="TrG5h" value="h" />
+          <node concept="3uibUv" id="1TH_SRmEWGx" role="1tU5fm">
+            <ref role="3uigEE" node="1TH_SRmEWG9" resolve="Bounds.H" />
+            <node concept="16syzq" id="1TH_SRmEWGy" role="11_B2D">
+              <ref role="16sUi3" node="1TH_SRmEWGD" resolve="S" />
+            </node>
+          </node>
+        </node>
+        <node concept="16syzq" id="1TH_SRmEWGz" role="3clF45">
+          <ref role="16sUi3" node="1TH_SRmEWGB" resolve="T5" />
+        </node>
+        <node concept="3clFbS" id="1TH_SRmEWG$" role="3clF47">
+          <node concept="3clFbF" id="1TH_SRmEWG_" role="3cqZAp">
+            <node concept="10Nm6u" id="1TH_SRmEWGA" role="3clFbG" />
+          </node>
+        </node>
+        <node concept="16euLQ" id="1TH_SRmEWGB" role="16eVyc">
+          <property role="TrG5h" value="T5" />
+          <node concept="3uibUv" id="1TH_SRmEWGC" role="3ztrMU">
+            <ref role="3uigEE" node="1TH_SRmEWFJ" resolve="Bounds.B" />
+          </node>
+        </node>
+        <node concept="16euLQ" id="1TH_SRmEWGD" role="16eVyc">
+          <property role="TrG5h" value="S" />
+          <node concept="3uibUv" id="1TH_SRmEWGE" role="3ztrMU">
+            <ref role="3uigEE" node="1TH_SRmEWFS" resolve="Bounds.J" />
+            <node concept="3qUtgH" id="1TH_SRmEWGF" role="11_B2D">
+              <node concept="16syzq" id="1TH_SRmEWGG" role="3qUvdb">
+                <ref role="16sUi3" node="1TH_SRmEWGB" resolve="T5" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3Tm6S6" id="1TH_SRmEWGU" role="1B3o_S" />
       <node concept="3clFb_" id="1TH_SRmJpwo" role="jymVt">
-        <property role="TrG5h" value="g1" />
+        <property role="TrG5h" value="g2A" />
         <node concept="37vLTG" id="1TH_SRmJpwp" role="3clF46">
           <property role="TrG5h" value="h" />
           <node concept="3uibUv" id="1TH_SRmJpwq" role="1tU5fm">
@@ -3511,14 +3620,14 @@
               <node concept="3uibUv" id="1TH_SRmJpws" role="3qUE_r">
                 <ref role="3uigEE" node="1TH_SRmEWFS" resolve="Bounds.J" />
                 <node concept="16syzq" id="1TH_SRmJpwt" role="11_B2D">
-                  <ref role="16sUi3" node="1TH_SRmJpwy" resolve="T3" />
+                  <ref role="16sUi3" node="1TH_SRmJpwy" resolve="T4" />
                 </node>
               </node>
             </node>
           </node>
         </node>
         <node concept="16syzq" id="1TH_SRmJpwu" role="3clF45">
-          <ref role="16sUi3" node="1TH_SRmJpwy" resolve="T3" />
+          <ref role="16sUi3" node="1TH_SRmJpwy" resolve="T4" />
         </node>
         <node concept="3clFbS" id="1TH_SRmJpwv" role="3clF47">
           <node concept="3clFbF" id="1TH_SRmJpww" role="3cqZAp">
@@ -3526,84 +3635,12 @@
           </node>
         </node>
         <node concept="16euLQ" id="1TH_SRmJpwy" role="16eVyc">
-          <property role="TrG5h" value="T3" />
+          <property role="TrG5h" value="T4" />
           <node concept="3uibUv" id="1TH_SRmJpwz" role="3ztrMU">
             <ref role="3uigEE" node="1TH_SRmEWFB" resolve="Bounds.A" />
           </node>
         </node>
       </node>
-      <node concept="3clFb_" id="1TH_SRmEWGv" role="jymVt">
-        <property role="TrG5h" value="g2" />
-        <node concept="37vLTG" id="1TH_SRmEWGw" role="3clF46">
-          <property role="TrG5h" value="h" />
-          <node concept="3uibUv" id="1TH_SRmEWGx" role="1tU5fm">
-            <ref role="3uigEE" node="1TH_SRmEWG9" resolve="Bounds.H" />
-            <node concept="16syzq" id="1TH_SRmEWGy" role="11_B2D">
-              <ref role="16sUi3" node="1TH_SRmEWGD" resolve="S1" />
-            </node>
-          </node>
-        </node>
-        <node concept="16syzq" id="1TH_SRmEWGz" role="3clF45">
-          <ref role="16sUi3" node="1TH_SRmEWGB" resolve="T4" />
-        </node>
-        <node concept="3clFbS" id="1TH_SRmEWG$" role="3clF47">
-          <node concept="3clFbF" id="1TH_SRmEWG_" role="3cqZAp">
-            <node concept="10Nm6u" id="1TH_SRmEWGA" role="3clFbG" />
-          </node>
-        </node>
-        <node concept="16euLQ" id="1TH_SRmEWGB" role="16eVyc">
-          <property role="TrG5h" value="T4" />
-          <node concept="3uibUv" id="1TH_SRmEWGC" role="3ztrMU">
-            <ref role="3uigEE" node="1TH_SRmEWFJ" resolve="Bounds.B" />
-          </node>
-        </node>
-        <node concept="16euLQ" id="1TH_SRmEWGD" role="16eVyc">
-          <property role="TrG5h" value="S1" />
-          <node concept="3uibUv" id="1TH_SRmEWGE" role="3ztrMU">
-            <ref role="3uigEE" node="1TH_SRmEWFS" resolve="Bounds.J" />
-            <node concept="3qUtgH" id="1TH_SRmEWGF" role="11_B2D">
-              <node concept="16syzq" id="1TH_SRmEWGG" role="3qUvdb">
-                <ref role="16sUi3" node="1TH_SRmEWGB" resolve="T4" />
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="3clFb_" id="1TH_SRmEWGH" role="jymVt">
-        <property role="TrG5h" value="g3" />
-        <node concept="37vLTG" id="1TH_SRmEWGI" role="3clF46">
-          <property role="TrG5h" value="h" />
-          <node concept="3uibUv" id="1TH_SRmEWGJ" role="1tU5fm">
-            <ref role="3uigEE" node="1TH_SRmEWG9" resolve="Bounds.H" />
-            <node concept="16syzq" id="1TH_SRmEWGK" role="11_B2D">
-              <ref role="16sUi3" node="1TH_SRmEWGQ" resolve="S2" />
-            </node>
-          </node>
-        </node>
-        <node concept="16syzq" id="1TH_SRmEWGL" role="3clF45">
-          <ref role="16sUi3" node="1TH_SRmEWGP" resolve="T5" />
-        </node>
-        <node concept="3clFbS" id="1TH_SRmEWGM" role="3clF47">
-          <node concept="3clFbF" id="1TH_SRmEWGN" role="3cqZAp">
-            <node concept="10Nm6u" id="1TH_SRmEWGO" role="3clFbG" />
-          </node>
-        </node>
-        <node concept="16euLQ" id="1TH_SRmEWGP" role="16eVyc">
-          <property role="TrG5h" value="T5" />
-        </node>
-        <node concept="16euLQ" id="1TH_SRmEWGQ" role="16eVyc">
-          <property role="TrG5h" value="S2" />
-          <node concept="3uibUv" id="1TH_SRmEWGR" role="3ztrMU">
-            <ref role="3uigEE" node="1TH_SRmEWFS" resolve="Bounds.J" />
-            <node concept="3qUtgH" id="1TH_SRmEWGS" role="11_B2D">
-              <node concept="16syzq" id="1TH_SRmEWGT" role="3qUvdb">
-                <ref role="16sUi3" node="1TH_SRmEWGP" resolve="T5" />
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="3Tm6S6" id="1TH_SRmEWGU" role="1B3o_S" />
       <node concept="1X3_iC" id="1TH_SRmJ$wF" role="lGtFl">
         <property role="3V$3am" value="member" />
         <property role="3V$3ak" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1107461130800/5375687026011219971" />
@@ -3640,9 +3677,628 @@
     <node concept="312cEu" id="1TH_SRmEWGV" role="jymVt">
       <property role="2bfB8j" value="true" />
       <property role="TrG5h" value="F" />
+      <node concept="312cEg" id="5o9$c3zqY$v" role="jymVt">
+        <property role="TrG5h" value="g" />
+        <node concept="3Tm6S6" id="5o9$c3zqY$w" role="1B3o_S" />
+        <node concept="3uibUv" id="1TH_SRmMhcl" role="1tU5fm">
+          <ref role="3uigEE" node="1TH_SRmEWGi" resolve="Bounds.G" />
+        </node>
+        <node concept="2ShNRf" id="4ekooLalg1r" role="33vP2m">
+          <node concept="HV5vD" id="4ekooLalg1s" role="2ShVmc">
+            <ref role="HV5vE" node="1TH_SRmEWGi" resolve="Bounds.G" />
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="5o9$c3zr9Ju" role="jymVt" />
+      <node concept="3clFb_" id="5o9$c3zqzPs" role="jymVt">
+        <property role="TrG5h" value="foo0" />
+        <property role="DiZV1" value="false" />
+        <node concept="3cqZAl" id="5o9$c3zqzPt" role="3clF45" />
+        <node concept="3clFbS" id="5o9$c3zqzPu" role="3clF47">
+          <node concept="3cpWs8" id="5o9$c3zrsef" role="3cqZAp">
+            <node concept="3cpWsn" id="5o9$c3zrseg" role="3cpWs9">
+              <property role="TrG5h" value="a0" />
+              <node concept="3uibUv" id="5o9$c3zrseh" role="1tU5fm">
+                <ref role="3uigEE" node="1TH_SRmEWFB" resolve="Bounds.A" />
+              </node>
+              <node concept="2OqwBi" id="5o9$c3zrsei" role="33vP2m">
+                <node concept="37vLTw" id="5o9$c3zrsej" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5o9$c3zqY$v" resolve="g" />
+                </node>
+                <node concept="liA8E" id="5o9$c3zrsek" role="2OqNvi">
+                  <ref role="37wK5l" node="1TH_SRmEWGH" resolve="g0" />
+                  <node concept="2OqwBi" id="5o9$c3zrsel" role="37wK5m">
+                    <node concept="37vLTw" id="5o9$c3zrsem" role="2Oq$k0">
+                      <ref role="3cqZAo" node="5o9$c3zqzPW" resolve="s" />
+                    </node>
+                    <node concept="liA8E" id="5o9$c3zrsen" role="2OqNvi">
+                      <ref role="37wK5l" node="1TH_SRmEWFV" resolve="h" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="5o9$c3zqzPH" role="3cqZAp">
+            <node concept="3cpWsn" id="5o9$c3zqzPI" role="3cpWs9">
+              <property role="TrG5h" value="a1" />
+              <node concept="3uibUv" id="5o9$c3zqzPJ" role="1tU5fm">
+                <ref role="3uigEE" node="1TH_SRmEWFB" resolve="Bounds.A" />
+              </node>
+              <node concept="2OqwBi" id="5o9$c3zqzPK" role="33vP2m">
+                <node concept="37vLTw" id="5o9$c3zqzPL" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5o9$c3zqY$v" resolve="g" />
+                </node>
+                <node concept="liA8E" id="5o9$c3zqzPM" role="2OqNvi">
+                  <ref role="37wK5l" node="5o9$c3zKs5N" resolve="gA" />
+                  <node concept="2OqwBi" id="5o9$c3zqzPN" role="37wK5m">
+                    <node concept="37vLTw" id="5o9$c3zqzPO" role="2Oq$k0">
+                      <ref role="3cqZAo" node="5o9$c3zqzPW" resolve="s" />
+                    </node>
+                    <node concept="liA8E" id="5o9$c3zqzPP" role="2OqNvi">
+                      <ref role="37wK5l" node="1TH_SRmEWFV" resolve="h" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="5o9$c3zrsTx" role="3cqZAp">
+            <node concept="3cpWsn" id="5o9$c3zrsTy" role="3cpWs9">
+              <property role="TrG5h" value="a2" />
+              <node concept="3uibUv" id="5o9$c3zrsTz" role="1tU5fm">
+                <ref role="3uigEE" node="1TH_SRmEWFB" resolve="Bounds.A" />
+              </node>
+              <node concept="2OqwBi" id="5o9$c3zrsT$" role="33vP2m">
+                <node concept="37vLTw" id="5o9$c3zrsT_" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5o9$c3zqY$v" resolve="g" />
+                </node>
+                <node concept="liA8E" id="5o9$c3zrsTA" role="2OqNvi">
+                  <ref role="37wK5l" node="1TH_SRmEWGv" resolve="gB" />
+                  <node concept="2OqwBi" id="5o9$c3zrsTB" role="37wK5m">
+                    <node concept="37vLTw" id="5o9$c3zrsTC" role="2Oq$k0">
+                      <ref role="3cqZAo" node="5o9$c3zqzPW" resolve="s" />
+                    </node>
+                    <node concept="liA8E" id="5o9$c3zrsTD" role="2OqNvi">
+                      <ref role="37wK5l" node="1TH_SRmEWFV" resolve="h" />
+                    </node>
+                  </node>
+                  <node concept="1U20sH" id="5o9$c3zrxIc" role="lGtFl">
+                    <property role="1U20sK" value="error" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="5o9$c3zrjCb" role="3cqZAp">
+            <node concept="3cpWsn" id="5o9$c3zrjCc" role="3cpWs9">
+              <property role="TrG5h" value="b2" />
+              <node concept="3uibUv" id="5o9$c3zrkd$" role="1tU5fm">
+                <ref role="3uigEE" node="1TH_SRmEWFJ" resolve="Bounds.B" />
+              </node>
+              <node concept="2OqwBi" id="5o9$c3zrjCe" role="33vP2m">
+                <node concept="37vLTw" id="5o9$c3zrjCf" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5o9$c3zqY$v" resolve="g" />
+                </node>
+                <node concept="liA8E" id="5o9$c3zrjCg" role="2OqNvi">
+                  <ref role="37wK5l" node="1TH_SRmEWGv" resolve="gB" />
+                  <node concept="2OqwBi" id="5o9$c3zrjCh" role="37wK5m">
+                    <node concept="37vLTw" id="5o9$c3zrjCi" role="2Oq$k0">
+                      <ref role="3cqZAo" node="5o9$c3zqzPW" resolve="s" />
+                    </node>
+                    <node concept="liA8E" id="5o9$c3zrjCj" role="2OqNvi">
+                      <ref role="37wK5l" node="1TH_SRmEWFV" resolve="h" />
+                    </node>
+                  </node>
+                  <node concept="1U20sH" id="5o9$c3zry8d" role="lGtFl">
+                    <property role="1U20sK" value="error" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3Tm1VV" id="5o9$c3zqzPQ" role="1B3o_S" />
+        <node concept="37vLTG" id="5o9$c3zqzPW" role="3clF46">
+          <property role="TrG5h" value="s" />
+          <node concept="3uibUv" id="5o9$c3zqRRs" role="1tU5fm">
+            <ref role="3uigEE" node="1TH_SRmEWFS" resolve="Bounds.J" />
+            <node concept="3qTvmN" id="5o9$c3zqSMH" role="11_B2D" />
+          </node>
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-              </node>
-              <node concept="2OqwBi" id="1TH_SRmEWIJ" role="33vP2m">
-                <node concept="37vLTw" id="1TH_SRmEWIK" role="2Oq$k0">
-                  <ref role="3cqZAo" node="1TH_SRmEWHH" resolve="g" />
-                </node>
-                <node concept="liA8E" id="1TH_SRmEWIL" role="2OqNvi">
-                  <ref role="37wK5l" node="1TH_SRmEWGH" resolve="g3" />
-                  <node concept="2OqwBi" id="1TH_SRmEWIM" role="37wK5m">
-                    <node concept="37vLTw" id="1TH_SRmEWIN" role="2Oq$k0">
-                      <ref role="3cqZAo" node="1TH_SRmEWIW" resolve="s" />
-                    </node>
-                    <node concept="liA8E" id="1TH_SRmEWIO" role="2OqNvi">
-                      <ref role="37wK5l" node="1TH_SRmEWFV" resolve="h" />
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
         </node>
         <node concept="3Tm1VV" id="1TH_SRmEWIP" role="1B3o_S" />
         <node concept="16euLQ" id="1TH_SRmEWIQ" role="16eVyc">
-          <property role="TrG5h" value="T5" />
+          <property role="TrG5h" value="T" />
           <node concept="3uibUv" id="1TH_SRmEWIR" role="3ztrMU">
             <ref role="3uigEE" node="1TH_SRmEWFJ" resolve="Bounds.B" />
           </node>
@@ -4085,7 +4566,7 @@
             <ref role="3uigEE" node="1TH_SRmEWFS" resolve="Bounds.J" />
             <node concept="3qUtgH" id="1TH_SRmEWIU" role="11_B2D">
               <node concept="16syzq" id="1TH_SRmEWIV" role="3qUvdb">
-                <ref role="16sUi3" node="1TH_SRmEWIQ" resolve="T5" />
+                <ref role="16sUi3" node="1TH_SRmEWIQ" resolve="T" />
               </node>
             </node>
           </node>
@@ -4106,104 +4587,7 @@
           </node>
         </node>
       </node>
-      <node concept="2tJIrI" id="3fECE2uQlOB" role="jymVt" />
-      <node concept="3clFb_" id="4ekooLalg15" role="jymVt">
-        <property role="TrG5h" value="f2" />
-        <property role="DiZV1" value="false" />
-        <node concept="3cqZAl" id="4ekooLalg16" role="3clF45" />
-        <node concept="3clFbS" id="4ekooLalg17" role="3clF47">
-          <node concept="3cpWs8" id="4ekooLalg1o" role="3cqZAp">
-            <node concept="3cpWsn" id="4ekooLalg1p" role="3cpWs9">
-              <property role="TrG5h" value="g" />
-              <node concept="3uibUv" id="1TH_SRmMhcl" role="1tU5fm">
-                <ref role="3uigEE" node="1TH_SRmEWGi" resolve="Bounds.G" />
-              </node>
-              <node concept="2ShNRf" id="4ekooLalg1r" role="33vP2m">
-                <node concept="HV5vD" id="4ekooLalg1s" role="2ShVmc">
-                  <ref role="HV5vE" node="1TH_SRmEWGi" resolve="Bounds.G" />
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbH" id="Co5va1RERG" role="3cqZAp" />
-          <node concept="3SKdUt" id="1TH_SRmMpkF" role="3cqZAp">
-            <node concept="1PaTwC" id="1TH_SRmMpkG" role="3ndbpf">
-              <node concept="3oM_SD" id="1TH_SRmMpkI" role="1PaTwD">
-                <property role="3oM_SC" value="FIXME" />
-              </node>
-              <node concept="3oM_SD" id="1TH_SRmMqrF" role="1PaTwD">
-                <property role="3oM_SC" value="the" />
-              </node>
-              <node concept="3oM_SD" id="1TH_SRmMqKK" role="1PaTwD">
-                <property role="3oM_SC" value="following" />
-              </node>
-              <node concept="3oM_SD" id="1TH_SRmMrdP" role="1PaTwD">
-                <property role="3oM_SC" value="line" />
-              </node>
-              <node concept="3oM_SD" id="1TH_SRmMrDL" role="1PaTwD">
-                <property role="3oM_SC" value="must" />
-              </node>
-              <node concept="3oM_SD" id="1TH_SRmMsBk" role="1PaTwD">
-                <property role="3oM_SC" value="typecheck" />
-              </node>
-            </node>
-          </node>
-          <node concept="3cpWs8" id="1TH_SRmMcgr" role="3cqZAp">
-            <node concept="3cpWsn" id="1TH_SRmMcgs" role="3cpWs9">
-              <property role="TrG5h" value="a3" />
-              <node concept="3uibUv" id="1TH_SRmMi14" role="1tU5fm">
-                <ref role="3uigEE" node="1TH_SRmEWFB" resolve="Bounds.A" />
-              </node>
-              <node concept="2OqwBi" id="1TH_SRmMcgt" role="33vP2m">
-                <node concept="37vLTw" id="1TH_SRmMcgu" role="2Oq$k0">
-                  <ref role="3cqZAo" node="4ekooLalg1p" resolve="g" />
-                </node>
-                <node concept="liA8E" id="1TH_SRmMcgv" role="2OqNvi">
-                  <ref role="37wK5l" node="1TH_SRmEWGH" resolve="g3" />
-                  <node concept="2OqwBi" id="1TH_SRmMcgw" role="37wK5m">
-                    <node concept="37vLTw" id="1TH_SRmMcgx" role="2Oq$k0">
-                      <ref role="3cqZAo" node="4ekooLalg2n" resolve="s" />
-                    </node>
-                    <node concept="liA8E" id="1TH_SRmMcgy" role="2OqNvi">
-                      <ref role="37wK5l" node="1TH_SRmEWFV" resolve="h" />
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3Tm1VV" id="4ekooLalg2g" role="1B3o_S" />
-        <node concept="16euLQ" id="4ekooLalg2h" role="16eVyc">
-          <property role="TrG5h" value="T6" />
-        </node>
-        <node concept="16euLQ" id="4ekooLalg2j" role="16eVyc">
-          <property role="TrG5h" value="S" />
-          <node concept="3uibUv" id="4ekooLalg2k" role="3ztrMU">
-            <ref role="3uigEE" node="1TH_SRmEWFS" resolve="Bounds.J" />
-            <node concept="3qUtgH" id="4ekooLalg2l" role="11_B2D">
-              <node concept="16syzq" id="4ekooLalg2m" role="3qUvdb">
-                <ref role="16sUi3" node="4ekooLalg2h" resolve="T6" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="37vLTG" id="4ekooLalg2n" role="3clF46">
-          <property role="TrG5h" value="s" />
-          <node concept="16syzq" id="4ekooLalg2o" role="1tU5fm">
-            <ref role="16sUi3" node="4ekooLalg2j" resolve="S" />
-          </node>
-        </node>
-        <node concept="37vLTG" id="4ekooLalg2p" role="3clF46">
-          <property role="TrG5h" value="h" />
-          <node concept="3uibUv" id="4ekooLalg2q" role="1tU5fm">
-            <ref role="3uigEE" node="1TH_SRmEWG9" resolve="Bounds.H" />
-            <node concept="3uibUv" id="1TH_SRmMgr6" role="11_B2D">
-              <ref role="3uigEE" node="1TH_SRmEWG5" resolve="Bounds.K" />
-            </node>
-          </node>
-        </node>
-      </node>
+      <node concept="2tJIrI" id="5o9$c3zsJCL" role="jymVt" />
     </node>
     <node concept="2tJIrI" id="1TH_SRmEWJ1" role="jymVt" />
   </node>
diff --git a/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.generics@tests.mps b/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.generics@tests.mps
index 6101799c..7f9ad7af 100644
--- a/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.generics@tests.mps
+++ b/samples/mpscore/solutions/jetbrains.mps.baseLanguageExt.test/models/jetbrains.mps.baseLanguageExt.test.generics@tests.mps
@@ -75,6 +75,9 @@
       <concept id="1178549954367" name="jetbrains.mps.baseLanguage.structure.IVisible" flags="ng" index="1B3ioH">
         <child id="1178549979242" name="visibility" index="1B3o_S" />
       </concept>
+      <concept id="6329021646629104954" name="jetbrains.mps.baseLanguage.structure.SingleLineComment" flags="nn" index="3SKdUt">
+        <child id="1350122676458893092" name="text" index="3ndbpf" />
+      </concept>
       <concept id="1146644623116" name="jetbrains.mps.baseLanguage.structure.PrivateVisibility" flags="nn" index="3Tm6S6" />
     </language>
     <language id="63650c59-16c8-498a-99c8-005c7ee9515d" name="jetbrains.mps.lang.access">
@@ -136,6 +139,14 @@
         <property id="1169194664001" name="name" index="TrG5h" />
       </concept>
     </language>
+    <language id="c7fb639f-be78-4307-89b0-b5959c3fa8c8" name="jetbrains.mps.lang.text">
+      <concept id="155656958578482948" name="jetbrains.mps.lang.text.structure.Word" flags="ng" index="3oM_SD">
+        <property id="155656958578482949" name="value" index="3oM_SC" />
+      </concept>
+      <concept id="2535923850359271782" name="jetbrains.mps.lang.text.structure.Line" flags="ng" index="1PaTwC">
+        <child id="2535923850359271783" name="elements" index="1PaTwD" />
+      </concept>
+    </language>
   </registry>
   <node concept="2XOHcx" id="1N_0WA5DT60">
     <property role="2XOHcw" value="${mpscore_home}" />
@@ -431,23 +442,68 @@
       <property role="TrG5h" value="Bounds" />
       <node concept="3cqZAl" id="1TH_SRmLuzj" role="3clF45" />
       <node concept="3clFbS" id="1TH_SRmLuzk" role="3clF47">
+        <node concept="3SKdUt" id="5o9$c3zUci1" role="3cqZAp">
+          <node concept="1PaTwC" id="5o9$c3zUci2" role="3ndbpf">
+            <node concept="3oM_SD" id="5o9$c3zUci4" role="1PaTwD">
+              <property role="3oM_SC" value="error" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUcnb" role="1PaTwD">
+              <property role="3oM_SC" value="types" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUcne" role="1PaTwD">
+              <property role="3oM_SC" value="are" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUcr5" role="1PaTwD">
+              <property role="3oM_SC" value="ignored" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUcyK" role="1PaTwD">
+              <property role="3oM_SC" value="on" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUcAD" role="1PaTwD">
+              <property role="3oM_SC" value="purpose:" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUcAK" role="1PaTwD">
+              <property role="3oM_SC" value="they" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUcEF" role="1PaTwD">
+              <property role="3oM_SC" value="arise" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUcMJ" role="1PaTwD">
+              <property role="3oM_SC" value="on" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUcUv" role="1PaTwD">
+              <property role="3oM_SC" value="expected" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUd63" role="1PaTwD">
+              <property role="3oM_SC" value="typechecking" />
+            </node>
+            <node concept="3oM_SD" id="5o9$c3zUddP" role="1PaTwD">
+              <property role="3oM_SC" value="errors" />
+            </node>
+          </node>
+        </node>
         <node concept="2Hmddi" id="1TH_SRmLuzl" role="3cqZAp">
           <node concept="2OqwBi" id="1TH_SRmLuzm" role="2Hmdds">
-            <node concept="2YIFZM" id="1TH_SRmLuzn" role="2Oq$k0">
-              <ref role="1Pybhc" to="tj24:1N_0WA5JxZO" resolve="TypecheckingTestHelper" />
-              <ref role="37wK5l" to="tj24:27bTNFfaOo$" resolve="ofNode" />
-              <node concept="2OqwBi" id="1TH_SRmLuzo" role="37wK5m">
-                <node concept="2WthIp" id="1TH_SRmLuzp" role="2Oq$k0" />
-                <node concept="2XshWL" id="1TH_SRmLuzq" role="2OqNvi">
-                  <ref role="2WH_rO" node="35YJGAJTxCf" resolve="resolve" />
-                  <node concept="2tJFMh" id="1TH_SRmLuzr" role="2XxRq1">
-                    <node concept="ZC_QK" id="1TH_SRmLvZX" role="2tJFKM">
-                      <ref role="2aWVGs" to="wqtl:1TH_SRmEWFy" resolve="Bounds" />
+            <node concept="2OqwBi" id="5o9$c3zUbSC" role="2Oq$k0">
+              <node concept="2YIFZM" id="1TH_SRmLuzn" role="2Oq$k0">
+                <ref role="1Pybhc" to="tj24:1N_0WA5JxZO" resolve="TypecheckingTestHelper" />
+                <ref role="37wK5l" to="tj24:27bTNFfaOo$" resolve="ofNode" />
+                <node concept="2OqwBi" id="1TH_SRmLuzo" role="37wK5m">
+                  <node concept="2WthIp" id="1TH_SRmLuzp" role="2Oq$k0" />
+                  <node concept="2XshWL" id="1TH_SRmLuzq" role="2OqNvi">
+                    <ref role="2WH_rO" node="35YJGAJTxCf" resolve="resolve" />
+                    <node concept="2tJFMh" id="1TH_SRmLuzr" role="2XxRq1">
+                      <node concept="ZC_QK" id="1TH_SRmLvZX" role="2tJFKM">
+                        <ref role="2aWVGs" to="wqtl:1TH_SRmEWFy" resolve="Bounds" />
+                      </node>
                     </node>
                   </node>
                 </node>
+                <node concept="1jxXqW" id="1TH_SRmLuzt" role="37wK5m" />
+              </node>
+              <node concept="liA8E" id="5o9$c3zUc8X" role="2OqNvi">
+                <ref role="37wK5l" to="tj24:2hrSdN96927" resolve="ignoreErrorTypes" />
               </node>
-              <node concept="1jxXqW" id="1TH_SRmLuzt" role="37wK5m" />
             </node>
             <node concept="liA8E" id="1TH_SRmLuzu" role="2OqNvi">
               <ref role="37wK5l" to="tj24:27bTNFfaYS2" resolve="checkTypes" />