diff --git a/samples/mpscore/languages/jetbrains.mps.baseLanguageExt/models/jetbrains.mps.baseLanguageExt.types.mps b/samples/mpscore/languages/jetbrains.mps.baseLanguageExt/models/jetbrains.mps.baseLanguageExt.types.mps
index f6ecaddb..14dc98ae 100644
--- a/samples/mpscore/languages/jetbrains.mps.baseLanguageExt/models/jetbrains.mps.baseLanguageExt.types.mps
+++ b/samples/mpscore/languages/jetbrains.mps.baseLanguageExt/models/jetbrains.mps.baseLanguageExt.types.mps
@@ -44176,9 +44176,9 @@
         </node>
       </node>
       <node concept="3clFbS" id="554EtBHVtoA" role="3hEL4E">
-        <node concept="3Aqczg" id="554EtBHVuby" role="3cqZAp">
-          <node concept="3A8Hvi" id="554EtBHVubz" role="3Aqpz8">
-            <node concept="9KH4l" id="554EtBHVub_" role="3A8w4Q">
+        <node concept="3Aqczg" id="3vTJNooXrOE" role="3cqZAp">
+          <node concept="3sO8UW" id="3vTJNooXrO$" role="3Aqpz8">
+            <node concept="9KH4l" id="554EtBHVub_" role="3sO8UZ">
               <node concept="37jhX" id="554EtBHVulo" role="9KHbC">
                 <node concept="1nq8_$" id="554EtBHVuln" role="37jj2">
                   <node concept="a7P8L" id="554EtBHVulm" role="1nq8_t">
@@ -44187,7 +44187,7 @@
                 </node>
               </node>
             </node>
-            <node concept="ns1u0" id="554EtBHVubE" role="3A8wtg">
+            <node concept="ns1u0" id="554EtBHVubE" role="3sO8UT">
               <ref role="ns1xF" node="4btN1w5A0eS" resolve="genDecl" />
               <node concept="nsMwS" id="554EtBHVubF" role="ns1xD">
                 <ref role="nsMwP" node="4btN1w5A0F6" resolve="tvars" />
@@ -44603,9 +44603,9 @@
                 </node>
               </node>
               <node concept="3clFbH" id="53tmmMslPNX" role="3cqZAp" />
-              <node concept="3Aqczg" id="53tmmMslPNY" role="3cqZAp">
-                <node concept="3A8Hvi" id="53tmmMslPNZ" role="3Aqpz8">
-                  <node concept="9KH4l" id="53tmmMslPO0" role="3A8w4Q">
+              <node concept="3Aqczg" id="3vTJNooXr4i" role="3cqZAp">
+                <node concept="3sO8UW" id="3vTJNooXr4c" role="3Aqpz8">
+                  <node concept="9KH4l" id="53tmmMslPO0" role="3sO8UZ">
                     <node concept="37jhX" id="53tmmMslPO1" role="9KHbC">
                       <node concept="1nq8_$" id="53tmmMslPO2" role="37jj2">
                         <node concept="a7P8L" id="53tmmMslPO3" role="1nq8_t">
@@ -44614,7 +44614,7 @@
                       </node>
                     </node>
                   </node>
-                  <node concept="ns1u0" id="53tmmMslPO4" role="3A8wtg">
+                  <node concept="ns1u0" id="53tmmMslPO4" role="3sO8UT">
                     <ref role="ns1xF" node="4btN1w5A0eS" resolve="genDecl" />
                     <node concept="nsMwS" id="53tmmMslPO5" role="ns1xD">
                       <ref role="nsMwP" node="5Oz70LKeVis" resolve="typeScheme" />
@@ -44661,182 +44661,8 @@
               </node>
               <node concept="3clFbH" id="53tmmMslPO_" role="3cqZAp" />
               <node concept="3clFbJ" id="53tmmMslPOA" role="3cqZAp">
-                <node concept="3clFbS" id="53tmmMslPOB" role="3clFbx">
-                  <node concept="3X$Joe" id="53tmmMslPOC" role="3cqZAp">
-                    <node concept="aZer4" id="53tmmMslPOD" role="3XD1gS">
-                      <property role="TrG5h" value="TyArgs" />
-                      <node concept="2OqwBi" id="53tmmMslPOE" role="3gj$pD">
-                        <node concept="3hN9Ij" id="53tmmMslPOF" role="2Oq$k0">
-                          <ref role="3hLkJx" node="53tmmMs9igS" resolve="tyArgs" />
-                        </node>
-                        <node concept="34oBXx" id="53tmmMslPOG" role="2OqNvi" />
-                      </node>
-                    </node>
-                    <node concept="aZer4" id="53tmmMslPOH" role="3XD1gS">
-                      <property role="TrG5h" value="TyArgCaps" />
-                      <node concept="2OqwBi" id="53tmmMslPOI" role="3gj$pD">
-                        <node concept="3hN9Ij" id="53tmmMslPOJ" role="2Oq$k0">
-                          <ref role="3hLkJx" node="53tmmMs9igS" resolve="tyArgs" />
-                        </node>
-                        <node concept="34oBXx" id="53tmmMslPOK" role="2OqNvi" />
-                      </node>
-                    </node>
-                    <node concept="32pEOW" id="53tmmMslPOL" role="3vLBG7" />
-                  </node>
-                  <node concept="3cpWs8" id="53tmmMsDKhQ" role="3cqZAp">
-                    <node concept="3cpWsn" id="53tmmMsDKhT" role="3cpWs9">
-                      <property role="TrG5h" value="allowUnchecked" />
-                      <node concept="10P_77" id="53tmmMsDKhO" role="1tU5fm" />
-                      <node concept="3K4zz7" id="53tmmMsJGjX" role="33vP2m">
-                        <node concept="3hN9Ij" id="53tmmMsJHhf" role="3K4E3e">
-                          <ref role="3hLkJx" node="53tmmMsDKj7" resolve="allowUncheckedConversions" />
-                        </node>
-                        <node concept="3clFbT" id="53tmmMsJHK0" role="3K4GZi" />
-                        <node concept="3y3z36" id="53tmmMsJFHH" role="3K4Cdx">
-                          <node concept="10Nm6u" id="53tmmMsJGj_" role="3uHU7w" />
-                          <node concept="3hN9Ij" id="53tmmMsJEWP" role="3uHU7B">
-                            <ref role="3hLkJx" node="53tmmMsDKj7" resolve="allowUncheckedConversions" />
-                          </node>
-                        </node>
-                      </node>
-                    </node>
-                  </node>
-                  <node concept="1Dw8fO" id="53tmmMslPOM" role="3cqZAp">
-                    <node concept="3clFbS" id="53tmmMslPON" role="2LFqv$">
-                      <node concept="3Aqczg" id="53tmmMslPOO" role="3cqZAp">
-                        <node concept="3jbYBd" id="53tmmMslPOP" role="3Aqpz8">
-                          <ref role="3jbY9l" node="5itBwMau8m1" resolve="lift" />
-                          <node concept="1y4W85" id="53tmmMslPOQ" role="3jbY8P">
-                            <node concept="37vLTw" id="53tmmMslPOR" role="1y58nS">
-                              <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
-                            </node>
-                            <node concept="3hN9Ij" id="53tmmMslPOS" role="1y566C">
-                              <ref role="3hLkJx" node="53tmmMs9igS" resolve="tyArgs" />
-                            </node>
-                          </node>
-                          <node concept="a7P8L" id="53tmmMslPOT" role="3jbY8V">
-                            <ref role="a7OzE" node="53tmmMslPOD" resolve="TyArgs" />
-                            <node concept="37vLTw" id="53tmmMslPOU" role="3gCZO6">
-                              <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
-                            </node>
-                          </node>
-                          <node concept="3jhG_Y" id="53tmmMslPOV" role="3jhGvd">
-                            <node concept="3jhG_Z" id="53tmmMslPOW" role="3jhGob">
-                              <ref role="3jhG_U" node="5itBwMaLICh" resolve="substitution" />
-                              <node concept="37vLTw" id="53tmmMslPOX" role="3jhG_S">
-                                <ref role="3cqZAo" node="53tmmMslPNn" resolve="subs" />
-                              </node>
-                            </node>
-                            <node concept="3jhG_Z" id="53tmmMslPOY" role="3jhGob">
-                              <ref role="3jhG_U" node="5itBwMb2a1b" resolve="allowUncheckedConversion" />
-                              <node concept="37vLTw" id="53tmmMsDL_i" role="3jhG_S">
-                                <ref role="3cqZAo" node="53tmmMsDKhT" resolve="allowUnchecked" />
-                              </node>
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-                        <node concept="3Aqt3T" id="53tmmMslPP2" role="3Aqpz8">
-                          <ref role="3AqCNq" node="3wxtToEiJ2j" resolve="captureBound" />
-                          <node concept="a7P8L" id="53tmmMslPP3" role="3AunhB">
-                            <ref role="a7OzE" node="53tmmMslPOH" resolve="TyArgCaps" />
-                            <node concept="37vLTw" id="53tmmMslPP4" role="3gCZO6">
-                              <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
-                            </node>
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-                          <node concept="a7P8L" id="53tmmMslPP5" role="3AunhB">
-                            <ref role="a7OzE" node="53tmmMslPOD" resolve="TyArgs" />
-                            <node concept="37vLTw" id="53tmmMslPP6" role="3gCZO6">
-                              <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
-                            </node>
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-                          <node concept="a7P8L" id="53tmmMslPP7" role="3AunhB">
-                            <ref role="a7OzE" node="53tmmMs9ij7" resolve="Bounds" />
-                            <node concept="37vLTw" id="53tmmMslPP8" role="3gCZO6">
-                              <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
-                            </node>
-                          </node>
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-                        <node concept="3Aqt3T" id="53tmmMslPPa" role="3Aqpz8">
-                          <ref role="3AqCNq" node="3MG3BxoG13Q" resolve="convertsToSafe" />
-                          <node concept="a7P8L" id="53tmmMslPPb" role="3AunhB">
-                            <ref role="a7OzE" node="53tmmMslPOH" resolve="TyArgCaps" />
-                            <node concept="37vLTw" id="53tmmMslPPc" role="3gCZO6">
-                              <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
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-                          <node concept="a7P8L" id="53tmmMslPPd" role="3AunhB">
-                            <ref role="a7OzE" node="53tmmMs9ij7" resolve="Bounds" />
-                            <node concept="37vLTw" id="53tmmMslPPe" role="3gCZO6">
-                              <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
-                            </node>
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-                          <node concept="37jhX" id="53tmmMslPPf" role="3AunhB">
-                            <node concept="1y4W85" id="53tmmMslPPg" role="37jj2">
-                              <node concept="37vLTw" id="53tmmMslPPh" role="1y58nS">
-                                <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
-                              </node>
-                              <node concept="3hN9Ij" id="53tmmMslPPi" role="1y566C">
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-                              </node>
-                            </node>
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-                          <node concept="HKQnh" id="53tmmMslPPj" role="3AunhB">
-                            <node concept="Xl_RD" id="53tmmMslPPk" role="HKQng">
-                              <property role="Xl_RC" value="wrong substitute" />
-                            </node>
-                          </node>
-                        </node>
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-                      <node concept="3Aqczg" id="53tmmMslPPl" role="3cqZAp">
-                        <node concept="3A8Hvi" id="53tmmMslPPm" role="3Aqpz8">
-                          <node concept="a7P8L" id="53tmmMslPPn" role="3A8wtg">
-                            <ref role="a7OzE" node="53tmmMs9ij0" resolve="InstTyVars" />
-                            <node concept="37vLTw" id="53tmmMslPPo" role="3gCZO6">
-                              <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
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-                          <node concept="a7P8L" id="53tmmMslPPp" role="3A8w4Q">
-                            <ref role="a7OzE" node="53tmmMslPOH" resolve="TyArgCaps" />
-                            <node concept="37vLTw" id="53tmmMslPPq" role="3gCZO6">
-                              <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
-                            </node>
-                          </node>
-                        </node>
-                      </node>
-                    </node>
-                    <node concept="3cpWsn" id="53tmmMslPPr" role="1Duv9x">
-                      <property role="TrG5h" value="i" />
-                      <node concept="10Oyi0" id="53tmmMslPPs" role="1tU5fm" />
-                      <node concept="3cmrfG" id="53tmmMslPPt" role="33vP2m">
-                        <property role="3cmrfH" value="0" />
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-                    <node concept="3eOVzh" id="53tmmMslPPu" role="1Dwp0S">
-                      <node concept="2OqwBi" id="53tmmMslPPv" role="3uHU7w">
-                        <node concept="3hN9Ij" id="53tmmMslPPw" role="2Oq$k0">
-                          <ref role="3hLkJx" node="53tmmMs9igS" resolve="tyArgs" />
-                        </node>
-                        <node concept="34oBXx" id="53tmmMslPPx" role="2OqNvi" />
-                      </node>
-                      <node concept="37vLTw" id="53tmmMslPPy" role="3uHU7B">
-                        <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
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-                    <node concept="3uNrnE" id="53tmmMslPPz" role="1Dwrff">
-                      <node concept="37vLTw" id="53tmmMslPP$" role="2$L3a6">
-                        <ref role="3cqZAo" node="53tmmMslPPr" resolve="i" />
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-                    </node>
-                  </node>
-                  <node concept="3clFbH" id="53tmmMtqdDS" role="3cqZAp" />
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-                <node concept="3eNFk2" id="53tmmMsU1OD" role="3eNLev">
-                  <node concept="3clFbS" id="53tmmMsU1OF" role="3eOfB_">
+                <node concept="9aQIb" id="3vTJNooNZLE" role="9aQIa">
+                  <node concept="3clFbS" id="53tmmMsU1OF" role="9aQI4">
                     <node concept="3SKdUt" id="53tmmMtpJiK" role="3cqZAp">
                       <node concept="1PaTwC" id="53tmmMtpJiL" role="1aUNEU">
                         <node concept="3oM_SD" id="53tmmMtpJiM" role="1PaTwD">
@@ -44898,183 +44724,297 @@
                         <ref role="3cqZAo" node="53tmmMslPMt" resolve="tvds" />
                       </node>
                     </node>
-                    <node concept="3clFbH" id="53tmmMtqdF0" role="3cqZAp" />
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-                    <node concept="3hN9Ij" id="53tmmMtpAJc" role="3uHU7B">
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-                <node concept="1Wc70l" id="53tmmMtq4_p" role="3clFbw">
-                  <node concept="3y3z36" id="53tmmMtq6K3" role="3uHU7B">
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-                    </node>
-                    <node concept="3GX2aA" id="53tmmMslPPB" role="2OqNvi" />
+                <node concept="3y3z36" id="3vTJNooNZLB" role="3clFbw">
+                  <node concept="3hN9Ij" id="53tmmMtpAJc" role="3uHU7B">
+                    <ref role="3hLkJx" node="53tmmMs9igS" resolve="tyArgs" />
                   </node>
+                  <node concept="10Nm6u" id="53tmmMtpJif" role="3uHU7w" />
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-                        <node concept="3oM_SD" id="53tmmMslPPX" role="1PaTwD">
-                          <property role="3oM_SC" value="there're" />
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-                        <node concept="3oM_SD" id="53tmmMslPPY" role="1PaTwD">
-                          <property role="3oM_SC" value="no" />
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-                        <node concept="3oM_SD" id="53tmmMslPPZ" role="1PaTwD">
-                          <property role="3oM_SC" value="explicit" />
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-                        <node concept="3oM_SD" id="53tmmMslPQ0" role="1PaTwD">
-                          <property role="3oM_SC" value="type" />
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-                        <node concept="3oM_SD" id="53tmmMslPQ1" role="1PaTwD">
-                          <property role="3oM_SC" value="args," />
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-                        <node concept="3oM_SD" id="53tmmMslPQ2" role="1PaTwD">
-                          <property role="3oM_SC" value="so" />
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-                        <node concept="3oM_SD" id="53tmmMslPQ3" role="1PaTwD">
-                          <property role="3oM_SC" value="produce" />
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-                          <property role="3oM_SC" value="type" />
-                        </node>
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-                          <property role="3oM_SC" value="variable" />
-                        </node>
-                        <node concept="3oM_SD" id="53tmmMslPQ6" role="1PaTwD">
-                          <property role="3oM_SC" value="bounds" />
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-                          <property role="3oM_SC" value="for" />
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-                          <property role="3oM_SC" value="type" />
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-                          <property role="3oM_SC" value="inference" />
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-                          <property role="3oM_SC" value="inst" />
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-                          <property role="3oM_SC" value="with" />
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-                          <property role="3oM_SC" value="hasBound" />
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-                          <property role="3oM_SC" value="for" />
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-                        <node concept="3oM_SD" id="53tmmMslPPL" role="1PaTwD">
-                          <property role="3oM_SC" value="inference," />
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-                        <node concept="3oM_SD" id="53tmmMslPPM" role="1PaTwD">
-                          <property role="3oM_SC" value="dispatch" />
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-                        <node concept="3oM_SD" id="53tmmMslPPN" role="1PaTwD">
-                          <property role="3oM_SC" value="by" />
-                        </node>
-                        <node concept="3oM_SD" id="53tmmMslPPO" role="1PaTwD">
-                          <property role="3oM_SC" value="gdecl:" />
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-                        <node concept="3oM_SD" id="53tmmMslPPP" role="1PaTwD">
-                          <property role="3oM_SC" value="do" />
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-                        <node concept="3oM_SD" id="53tmmMslPPQ" role="1PaTwD">
-                          <property role="3oM_SC" value="only" />
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-                          <property role="3oM_SC" value="for" />
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-                          <property role="3oM_SC" value="IMethodCall" />
-                        </node>
-                        <node concept="3oM_SD" id="53tmmMtc6v7" role="1PaTwD">
-                          <property role="3oM_SC" value="&amp;" />
-                        </node>
-                        <node concept="3oM_SD" id="53tmmMtc6vm" role="1PaTwD">
-                          <property role="3oM_SC" value="Class" />
-                        </node>
-                        <node concept="3oM_SD" id="53tmmMtc6vA" role="1PaTwD">
-                          <property role="3oM_SC" value="Creators" />
-                        </node>
-                        <node concept="3oM_SD" id="53tmmMtc6vR" role="1PaTwD">
-                          <property role="3oM_SC" value="||" />
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