diff --git a/samples/lambdacalc/languages/samples.lambdacalc/models/editor.mps b/samples/lambdacalc/languages/samples.lambdacalc/models/editor.mps
index 83c13323..0700db0a 100644
--- a/samples/lambdacalc/languages/samples.lambdacalc/models/editor.mps
+++ b/samples/lambdacalc/languages/samples.lambdacalc/models/editor.mps
@@ -106,6 +106,7 @@
         <reference id="7991336459489872009" name="outputConcept" index="3EoQqy" />
       </concept>
       <concept id="1073389214265" name="jetbrains.mps.lang.editor.structure.EditorCellModel" flags="ng" index="3EYTF0">
+        <property id="1130859485024" name="attractsFocus" index="1cu_pB" />
         <child id="1142887637401" name="renderingCondition" index="pqm2j" />
       </concept>
       <concept id="1073389446423" name="jetbrains.mps.lang.editor.structure.CellModel_Collection" flags="sn" stub="3013115976261988961" index="3EZMnI">
@@ -901,6 +902,7 @@
       </node>
       <node concept="3F2HdR" id="48ZGLP7q1QZ" role="3EZMnx">
         <property role="2czwfO" value=" " />
+        <property role="1cu_pB" value="0" />
         <ref role="1NtTu8" to="8tt8:48ZGLP7q1Qc" resolve="typeVars" />
         <node concept="2iRfu4" id="48ZGLP7q1R2" role="2czzBx" />
       </node>
diff --git a/samples/lambdacalc/languages/samples.lambdacalc/models/types.mps b/samples/lambdacalc/languages/samples.lambdacalc/models/types.mps
index e1f54633..68de8171 100644
--- a/samples/lambdacalc/languages/samples.lambdacalc/models/types.mps
+++ b/samples/lambdacalc/languages/samples.lambdacalc/models/types.mps
@@ -2352,6 +2352,341 @@
         </node>
       </node>
     </node>
+    <node concept="1X3_iC" id="1IKbs5XlgxQ" role="lGtFl">
+      <property role="3V$3am" value="template" />
+      <property role="3V$3ak" value="c4803b19-6d89-4a3b-bf82-390769514add/8335224865066015764/3575255234175157601" />
+      <node concept="1nLNMY" id="1IKbs5XkwLY" role="8Wnug">
+        <property role="TrG5h" value="typeoOf_App" />
+        <node concept="3clFbS" id="1IKbs5XkwLZ" role="1nLNMH">
+          <node concept="1nLNNL" id="1IKbs5XkwM0" role="3cqZAp">
+            <node concept="1nLNMm" id="1IKbs5XkwM1" role="1nLNNK">
+              <node concept="0eUR_" id="1IKbs5XkwM2" role="0UC6o">
+                <node concept="3NuqgR" id="1IKbs5XkwM3" role="0eVf_">
+                  <node concept="aZer4" id="1IKbs5XkwM4" role="3XD1gS">
+                    <property role="TrG5h" value="F" />
+                  </node>
+                  <node concept="aZer4" id="1IKbs5XkwM5" role="3XD1gS">
+                    <property role="TrG5h" value="A" />
+                  </node>
+                </node>
+                <node concept="3NuqgR" id="1IKbs5XkwM6" role="0eVf_">
+                  <node concept="aZer4" id="1IKbs5XkwM7" role="3XD1gS">
+                    <property role="TrG5h" value="FA" />
+                  </node>
+                  <node concept="aZer4" id="1IKbs5XkwM8" role="3XD1gS">
+                    <property role="TrG5h" value="FR" />
+                  </node>
+                  <node concept="aZer4" id="1IKbs5XkwM9" role="3XD1gS">
+                    <property role="TrG5h" value="FI" />
+                  </node>
+                  <node concept="aZer4" id="1IKbs5XkwMa" role="3XD1gS">
+                    <property role="TrG5h" value="AG" />
+                  </node>
+                </node>
+                <node concept="3NuqgR" id="1IKbs5XkwMb" role="0eVf_">
+                  <node concept="aZer4" id="1IKbs5XkwMc" role="3XD1gS">
+                    <property role="TrG5h" value="E" />
+                  </node>
+                  <node concept="17QB3L" id="1IKbs5XkwMd" role="3vLBG7" />
+                </node>
+                <node concept="3NuqgR" id="1IKbs5XkwMe" role="0eVf_">
+                  <node concept="aZer4" id="1IKbs5XkwMf" role="3XD1gS">
+                    <property role="TrG5h" value="TVsF" />
+                  </node>
+                  <node concept="aZer4" id="1IKbs5XkwMg" role="3XD1gS">
+                    <property role="TrG5h" value="TVsA" />
+                  </node>
+                  <node concept="aZer4" id="1IKbs5XkwMh" role="3XD1gS">
+                    <property role="TrG5h" value="TVs" />
+                  </node>
+                </node>
+                <node concept="3NuqgR" id="1IKbs5XkwMi" role="0eVf_">
+                  <node concept="aZer4" id="1IKbs5XkwMj" role="3XD1gS">
+                    <property role="TrG5h" value="ITVsF" />
+                  </node>
+                </node>
+              </node>
+              <node concept="3Aq93q" id="1IKbs5XkwMp" role="1nLNMb">
+                <property role="3ArMco" value="true" />
+                <node concept="3I6sU6" id="1IKbs5XkwMq" role="3Ip0Jz">
+                  <node concept="3I6s7M" id="1IKbs5XkwMr" role="3I6sU7">
+                    <node concept="3Aqt3T" id="1IKbs5XkwMs" role="3I6s78">
+                      <ref role="3AqCNq" node="4KALGUEgLbG" resolve="typeOf" />
+                      <node concept="3BlFb$" id="1IKbs5XkwMt" role="3AunhB">
+                        <node concept="2OqwBi" id="1IKbs5XkwMu" role="3BlFb_">
+                          <node concept="3A2sRY" id="1IKbs5XkwMv" role="2Oq$k0">
+                            <ref role="3A2yKK" node="1IKbs5XkwOt" resolve="app" />
+                          </node>
+                          <node concept="3TrEf2" id="1IKbs5XkwMw" role="2OqNvi">
+                            <ref role="3Tt5mk" to="8tt8:7_8aRkgDGPL" resolve="fun" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="a7P8L" id="1IKbs5XkwMx" role="3AunhB">
+                        <ref role="a7OzE" node="1IKbs5XkwM4" resolve="F" />
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3I6s7M" id="1IKbs5XkwMy" role="3I6sU7">
+                    <node concept="3Aqt3T" id="1IKbs5XkwMz" role="3I6s78">
+                      <ref role="3AqCNq" node="4KALGUEgLbG" resolve="typeOf" />
+                      <node concept="3BlFb$" id="1IKbs5XkwM$" role="3AunhB">
+                        <node concept="2OqwBi" id="1IKbs5XkwM_" role="3BlFb_">
+                          <node concept="3A2sRY" id="1IKbs5XkwMA" role="2Oq$k0">
+                            <ref role="3A2yKK" node="1IKbs5XkwOt" resolve="app" />
+                          </node>
+                          <node concept="3TrEf2" id="1IKbs5XkwMB" role="2OqNvi">
+                            <ref role="3Tt5mk" to="8tt8:7_8aRkgDGPX" resolve="arg" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="a7P8L" id="1IKbs5XkwMC" role="3AunhB">
+                        <ref role="a7OzE" node="1IKbs5XkwM5" resolve="A" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3Aq93q" id="1IKbs5XkwMD" role="1nLNMb">
+                <property role="3ArMco" value="true" />
+                <node concept="3I6sU6" id="1IKbs5XkwME" role="3Ip0Jz">
+                  <node concept="3I6s7M" id="1IKbs5XkwMF" role="3I6sU7">
+                    <node concept="3Aqt3T" id="1IKbs5XkwMG" role="3I6s78">
+                      <ref role="3AqCNq" node="48ZGLP7ph5I" resolve="newTypeVars" />
+                      <node concept="3BlFb$" id="1IKbs5XkwMH" role="3AunhB">
+                        <node concept="2OqwBi" id="1IKbs5XkwMI" role="3BlFb_">
+                          <node concept="3A2sRY" id="1IKbs5XkwMJ" role="2Oq$k0">
+                            <ref role="3A2yKK" node="1IKbs5XkwOt" resolve="app" />
+                          </node>
+                          <node concept="3TrEf2" id="1IKbs5XkwMK" role="2OqNvi">
+                            <ref role="3Tt5mk" to="8tt8:7_8aRkgDGPL" resolve="fun" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="a7P8L" id="1IKbs5XkwML" role="3AunhB">
+                        <ref role="a7OzE" node="1IKbs5XkwMf" resolve="TVsF" />
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3I6s7M" id="1IKbs5XkwMM" role="3I6sU7">
+                    <node concept="3Aqt3T" id="1IKbs5XkwMN" role="3I6s78">
+                      <ref role="3AqCNq" node="48ZGLP7ph5I" resolve="newTypeVars" />
+                      <node concept="3BlFb$" id="1IKbs5XkwMO" role="3AunhB">
+                        <node concept="2OqwBi" id="1IKbs5XkwMP" role="3BlFb_">
+                          <node concept="3A2sRY" id="1IKbs5XkwMQ" role="2Oq$k0">
+                            <ref role="3A2yKK" node="1IKbs5XkwOt" resolve="app" />
+                          </node>
+                          <node concept="3TrEf2" id="1IKbs5XkwMR" role="2OqNvi">
+                            <ref role="3Tt5mk" to="8tt8:7_8aRkgDGPX" resolve="arg" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="a7P8L" id="1IKbs5XkwMS" role="3AunhB">
+                        <ref role="a7OzE" node="1IKbs5XkwMg" resolve="TVsA" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3Aq9E8" id="1IKbs5XkwMT" role="1nLNMd">
+                <node concept="3I6sU6" id="1IKbs5XkwMU" role="3Ip0Jz">
+                  <node concept="3IrJb3" id="1IKbs5XkwMV" role="3I6sU7">
+                    <node concept="3clFbS" id="1IKbs5XkwMW" role="3IrJb0">
+                      <node concept="3Aqczg" id="1IKbs5XkwMX" role="3cqZAp">
+                        <node concept="3Aqt3T" id="1IKbs5XkwMY" role="3Aqpz8">
+                          <ref role="3AqCNq" node="12dHl3ZCEx3" resolve="inst" />
+                          <node concept="a7P8L" id="1IKbs5XkwMZ" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwM9" resolve="FI" />
+                          </node>
+                          <node concept="a7P8L" id="1IKbs5XkwN0" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwM4" resolve="F" />
+                          </node>
+                          <node concept="a7P8L" id="1IKbs5XkwN1" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwMj" resolve="ITVsF" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3Aqczg" id="1IKbs5XkwN2" role="3cqZAp">
+                        <node concept="3A8Hvi" id="1IKbs5XkwN3" role="3Aqpz8">
+                          <node concept="a7P8L" id="1IKbs5XkwN4" role="3A8wtg">
+                            <ref role="a7OzE" node="1IKbs5XkwM9" resolve="FI" />
+                          </node>
+                          <node concept="ns1u0" id="1IKbs5XkwN5" role="3A8w4Q">
+                            <ref role="ns1xF" node="7VBaGntJSG2" resolve="Fun" />
+                            <node concept="nsMwS" id="1IKbs5XkwN6" role="ns1xD">
+                              <ref role="nsMwP" node="7VBaGntJSG4" resolve="arg" />
+                              <node concept="1nq8_$" id="1IKbs5XkwN7" role="nsMwV">
+                                <node concept="a7P8L" id="1IKbs5XkwN8" role="1nq8_t">
+                                  <ref role="a7OzE" node="1IKbs5XkwM7" resolve="FA" />
+                                </node>
+                              </node>
+                            </node>
+                            <node concept="nsMwS" id="1IKbs5XkwN9" role="ns1xD">
+                              <ref role="nsMwP" node="7VBaGntJSG5" resolve="res" />
+                              <node concept="1nq8_$" id="1IKbs5XkwNa" role="nsMwV">
+                                <node concept="a7P8L" id="1IKbs5XkwNb" role="1nq8_t">
+                                  <ref role="a7OzE" node="1IKbs5XkwM8" resolve="FR" />
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3clFbH" id="1IKbs5XkwNc" role="3cqZAp" />
+                      <node concept="3Aqczg" id="1IKbs5Xkx$0" role="3cqZAp">
+                        <node concept="3Aqt3T" id="1IKbs5Xkx_m" role="3Aqpz8">
+                          <ref role="3AqCNq" node="48ZGLP7O6fU" resolve="gen0" />
+                          <node concept="a7P8L" id="1IKbs5Xkx_B" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwMa" resolve="AG" />
+                          </node>
+                          <node concept="a7P8L" id="1IKbs5Xkx_N" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwM5" resolve="A" />
+                          </node>
+                          <node concept="a7P8L" id="1IKbs5Xkx_U" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwMg" resolve="TVsA" />
+                          </node>
+                          <node concept="3BlFb$" id="1IKbs5XkxA6" role="3AunhB">
+                            <node concept="2OqwBi" id="1IKbs5XkxIH" role="3BlFb_">
+                              <node concept="3A2sRY" id="1IKbs5XkxAi" role="2Oq$k0">
+                                <ref role="3A2yKK" node="1IKbs5XkwOt" resolve="app" />
+                              </node>
+                              <node concept="3TrEf2" id="1IKbs5Xkyg5" role="2OqNvi">
+                                <ref role="3Tt5mk" to="8tt8:7_8aRkgDGPX" resolve="arg" />
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3Aqczg" id="1IKbs5XkwNj" role="3cqZAp">
+                        <node concept="3Aqt3T" id="1IKbs5XkwNk" role="3Aqpz8">
+                          <ref role="3AqCNq" node="48ZGLP8pG4u" resolve="subsumed" />
+                          <node concept="a7P8L" id="1IKbs5XkwNl" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwM7" resolve="FA" />
+                          </node>
+                          <node concept="a7P8L" id="1IKbs5Xkyii" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwMa" resolve="AG" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3Aqczg" id="1IKbs5XkwNn" role="3cqZAp">
+                        <node concept="3Aqt3T" id="1IKbs5XkwNo" role="3Aqpz8">
+                          <ref role="3AqCNq" node="4KALGUEgLbG" resolve="typeOf" />
+                          <node concept="3BlFb$" id="1IKbs5XkwNp" role="3AunhB">
+                            <node concept="3A2sRY" id="1IKbs5XkwNq" role="3BlFb_">
+                              <ref role="3A2yKK" node="1IKbs5XkwOt" resolve="app" />
+                            </node>
+                          </node>
+                          <node concept="a7P8L" id="1IKbs5XkwNr" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwM8" resolve="FR" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3clFbH" id="1IKbs5XkwNs" role="3cqZAp" />
+                      <node concept="3Aqczg" id="1IKbs5XkwNt" role="3cqZAp">
+                        <node concept="3Aqt3T" id="1IKbs5XkwNu" role="3Aqpz8">
+                          <ref role="3AqCNq" node="48ZGLP7pl5A" resolve="append" />
+                          <node concept="a7P8L" id="1IKbs5XkwNv" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwMf" resolve="TVsF" />
+                          </node>
+                          <node concept="a7P8L" id="1IKbs5XkwNw" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwMj" resolve="ITVsF" />
+                          </node>
+                          <node concept="a7P8L" id="1IKbs5XkynN" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwMh" resolve="TVs" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3Aqczg" id="1IKbs5XkwNY" role="3cqZAp">
+                        <node concept="3GeI9q" id="1IKbs5XkwNZ" role="3Aqpz8">
+                          <node concept="a7P8L" id="1IKbs5XkwO0" role="3GeI8F">
+                            <ref role="a7OzE" node="1IKbs5XkwMh" resolve="TVs" />
+                          </node>
+                          <node concept="ns1u0" id="1IKbs5XkwO1" role="3GeI8D">
+                            <ref role="ns1xF" node="48ZGLP7pl6j" resolve="Cons" />
+                            <node concept="nsMwS" id="1IKbs5XkwO2" role="ns1xD">
+                              <ref role="nsMwP" node="48ZGLP7pl6$" resolve="head" />
+                              <node concept="1nq8_$" id="1IKbs5XkwO3" role="nsMwV">
+                                <node concept="a7P8L" id="1IKbs5XkwO4" role="1nq8_t">
+                                  <ref role="a7OzE" node="1IKbs5XkwM8" resolve="FR" />
+                                </node>
+                              </node>
+                            </node>
+                            <node concept="nsMwS" id="1IKbs5XkwO5" role="ns1xD">
+                              <ref role="nsMwP" node="48ZGLP7pl6J" resolve="tail" />
+                              <node concept="1nq8_$" id="1IKbs5XkwO6" role="nsMwV">
+                                <node concept="a7P8L" id="1IKbs5XkyoV" role="1nq8_t">
+                                  <ref role="a7OzE" node="1IKbs5XkwMh" resolve="TVs" />
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3Aqczg" id="1IKbs5XkwO8" role="3cqZAp">
+                        <node concept="3Aqt3T" id="1IKbs5XkwO9" role="3Aqpz8">
+                          <ref role="3AqCNq" node="48ZGLP7ph5I" resolve="newTypeVars" />
+                          <node concept="3BlFb$" id="1IKbs5XkwOa" role="3AunhB">
+                            <node concept="3A2sRY" id="1IKbs5XkwOb" role="3BlFb_">
+                              <ref role="3A2yKK" node="1IKbs5XkwOt" resolve="app" />
+                            </node>
+                          </node>
+                          <node concept="a7P8L" id="1IKbs5XkwOc" role="3AunhB">
+                            <ref role="a7OzE" node="1IKbs5XkwMh" resolve="TVs" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3Aq9E8" id="1IKbs5XkwOd" role="1nLNMd">
+                <node concept="3I6sU6" id="1IKbs5XkwOe" role="3Ip0Jz">
+                  <node concept="3I6s7M" id="1IKbs5XkwOf" role="3I6sU7">
+                    <node concept="3wWvb2" id="1IKbs5XkwOg" role="3I6s78">
+                      <node concept="2OqwBi" id="1IKbs5XkwOh" role="3wWo3s">
+                        <node concept="3A2sRY" id="1IKbs5XkwOi" role="2Oq$k0">
+                          <ref role="3A2yKK" node="1IKbs5XkwOt" resolve="app" />
+                        </node>
+                        <node concept="2s7oft" id="1IKbs5XkwOj" role="2OqNvi">
+                          <property role="2s7ueQ" value="error" />
+                          <node concept="2YIFZM" id="1IKbs5XkwOk" role="2s7u9n">
+                            <ref role="37wK5l" to="wyt6:~String.format(java.lang.String,java.lang.Object...):java.lang.String" resolve="format" />
+                            <ref role="1Pybhc" to="wyt6:~String" resolve="String" />
+                            <node concept="Xl_RD" id="1IKbs5XkwOl" role="37wK5m">
+                              <property role="Xl_RC" value="cannot unify '%s' and '%s'" />
+                            </node>
+                            <node concept="1TmgYN" id="1IKbs5XkwOm" role="37wK5m">
+                              <node concept="1nq8_$" id="1IKbs5XkwOn" role="1Tms7$">
+                                <node concept="a7P8L" id="1IKbs5XkwOo" role="1nq8_t">
+                                  <ref role="a7OzE" node="1IKbs5XkwM7" resolve="FA" />
+                                </node>
+                              </node>
+                            </node>
+                            <node concept="1TmgYN" id="1IKbs5XkwOp" role="37wK5m">
+                              <node concept="1nq8_$" id="1IKbs5XkwOq" role="1Tms7$">
+                                <node concept="a7P8L" id="1IKbs5XkwOr" role="1nq8_t">
+                                  <ref role="a7OzE" node="1IKbs5XkwM5" resolve="A" />
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="2t___k" id="1IKbs5XkwOs" role="1nLNMg">
+          <ref role="2t_S0q" to="8tt8:7_8aRkgDGPK" resolve="App" />
+          <node concept="3A20r5" id="1IKbs5XkwOt" role="2t_VXX">
+            <property role="TrG5h" value="app" />
+          </node>
+        </node>
+      </node>
+    </node>
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@@ -2879,341 +3214,6 @@
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@@ -7444,7 +7444,7 @@
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@@ -7452,8 +7452,29 @@
         <property role="TrG5h" value="toRename" />
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       <node concept="1zAUYm" id="48ZGLP92BR7" role="1zAUyy">
+        <property role="TrG5h" value="originalTypeVars" />
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+    <node concept="3AqmO8" id="1IKbs5XihHK" role="8PkJo">
+      <property role="TrG5h" value="checkTypeVars" />
+      <node concept="1zAUYm" id="1IKbs5XihLJ" role="1zAUyy">
         <property role="TrG5h" value="typeVars" />
       </node>
+      <node concept="1zAUYm" id="1IKbs5XihHW" role="1zAUyy">
+        <property role="TrG5h" value="originalTypeVars" />
+      </node>
+    </node>
+    <node concept="3AqmO8" id="1IKbs5Xj1B1" role="8PkJo">
+      <property role="TrG5h" value="checkTypeVarsFail" />
     </node>
     <node concept="1nLNMY" id="48ZGLP92BRC" role="1nK1Vg">
       <property role="TrG5h" value="renameTypeVars" />
@@ -7769,74 +7790,214 @@
         </node>
       </node>
     </node>
-    <node concept="1nLNMY" id="1IKbs5Xw9ST" role="1nK1Vg">
-      <property role="TrG5h" value="tryRenameTypeVars" />
-      <node concept="3clFbS" id="1IKbs5Xw9SU" role="1nLNMH">
-        <node concept="1nLNNL" id="1IKbs5Xwa00" role="3cqZAp">
-          <node concept="1nLNMm" id="1IKbs5Xwa01" role="1nLNNK">
-            <node concept="3Aq9E8" id="1IKbs5Xwa02" role="1nLNMd">
-              <node concept="3I6sU6" id="1IKbs5Xwa03" role="3Ip0Jz">
-                <node concept="3I6s7M" id="1IKbs5Xwa43" role="3I6sU7">
-                  <node concept="3A8Hvi" id="1IKbs5Xwa3X" role="3I6s78">
-                    <node concept="a7P8L" id="1IKbs5Xwa4c" role="3A8wtg">
-                      <ref role="a7OzE" node="1IKbs5Xwa0k" resolve="TestITVs" />
+    <node concept="1nLNMY" id="1IKbs5Xzy_T" role="1nK1Vg">
+      <property role="TrG5h" value="renameTypeVars_fail" />
+      <node concept="3clFbS" id="1IKbs5Xzy_U" role="1nLNMH">
+        <node concept="1nLNNL" id="1IKbs5Xzy_V" role="3cqZAp">
+          <node concept="1nLNMm" id="1IKbs5Xzy_W" role="1nLNNK">
+            <node concept="0eUR_" id="1IKbs5Xzy_X" role="0UC6o">
+              <node concept="3NuqgR" id="1IKbs5Xzy_Y" role="0eVf_">
+                <node concept="aZer4" id="1IKbs5Xzy_Z" role="3XD1gS">
+                  <property role="TrG5h" value="OrigTVar" />
+                </node>
+                <node concept="aZer4" id="1IKbs5XzyA0" role="3XD1gS">
+                  <property role="TrG5h" value="TVar" />
+                </node>
+                <node concept="aZer4" id="1IKbs5XzyA1" role="3XD1gS">
+                  <property role="TrG5h" value="TVsTail" />
+                </node>
+                <node concept="aZer4" id="1IKbs5XzyA2" role="3XD1gS">
+                  <property role="TrG5h" value="ITVsTail" />
+                </node>
+              </node>
+            </node>
+            <node concept="3Aq93q" id="1IKbs5XzyA3" role="1nLNMb">
+              <node concept="3I6sU6" id="1IKbs5XzyA4" role="3Ip0Jz">
+                <node concept="3I6s7M" id="1IKbs5XzyA5" role="3I6sU7">
+                  <node concept="3Aqt3T" id="1IKbs5XzyA6" role="3I6s78">
+                    <ref role="3AqCNq" node="48ZGLP92BQW" resolve="renameTypeVars" />
+                    <node concept="ns1u0" id="1IKbs5XzyA7" role="3AunhB">
+                      <ref role="ns1xF" node="48ZGLP7pl6j" resolve="Cons" />
+                      <node concept="nsMwS" id="1IKbs5XzyA8" role="ns1xD">
+                        <ref role="nsMwP" node="48ZGLP7pl6$" resolve="head" />
+                        <node concept="1nq8_$" id="1IKbs5XzyA9" role="nsMwV">
+                          <node concept="a7P8L" id="1IKbs5XzyAa" role="1nq8_t">
+                            <ref role="a7OzE" node="1IKbs5XzyA0" resolve="TVar" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="nsMwS" id="1IKbs5XzyAb" role="ns1xD">
+                        <ref role="nsMwP" node="48ZGLP7pl6J" resolve="tail" />
+                        <node concept="1nq8_$" id="1IKbs5XzyAc" role="nsMwV">
+                          <node concept="a7P8L" id="1IKbs5XzyAd" role="1nq8_t">
+                            <ref role="a7OzE" node="1IKbs5XzyA2" resolve="ITVsTail" />
+                          </node>
+                        </node>
+                      </node>
                     </node>
-                    <node concept="9KH4l" id="1IKbs5Xwa4h" role="3A8w4Q">
-                      <node concept="a7P8L" id="1IKbs5Xwa4n" role="9KHbC">
-                        <ref role="a7OzE" node="1IKbs5Xwa0h" resolve="ITVs" />
+                    <node concept="ns1u0" id="1IKbs5XzyAe" role="3AunhB">
+                      <ref role="ns1xF" node="48ZGLP7pl6j" resolve="Cons" />
+                      <node concept="nsMwS" id="1IKbs5XzyAf" role="ns1xD">
+                        <ref role="nsMwP" node="48ZGLP7pl6$" resolve="head" />
+                        <node concept="1nq8_$" id="1IKbs5XzyAg" role="nsMwV">
+                          <node concept="a7P8L" id="1IKbs5XzyAh" role="1nq8_t">
+                            <ref role="a7OzE" node="1IKbs5Xzy_Z" resolve="OrigTVar" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="nsMwS" id="1IKbs5XzyAi" role="ns1xD">
+                        <ref role="nsMwP" node="48ZGLP7pl6J" resolve="tail" />
+                        <node concept="1nq8_$" id="1IKbs5XzyAj" role="nsMwV">
+                          <node concept="a7P8L" id="1IKbs5XzyAk" role="1nq8_t">
+                            <ref role="a7OzE" node="1IKbs5XzyA1" resolve="TVsTail" />
+                          </node>
+                        </node>
                       </node>
                     </node>
                   </node>
                 </node>
-                <node concept="3I6s7M" id="1IKbs5Xwa4H" role="3I6sU7">
-                  <node concept="3Aqt3T" id="1IKbs5XwTNi" role="3I6s78">
-                    <ref role="3AqCNq" node="48ZGLP92BQW" resolve="renameTypeVars" />
-                    <node concept="a7P8L" id="1IKbs5XwTNr" role="3AunhB">
-                      <ref role="a7OzE" node="1IKbs5Xwa0k" resolve="TestITVs" />
-                    </node>
-                    <node concept="a7P8L" id="1IKbs5XwTNz" role="3AunhB">
-                      <ref role="a7OzE" node="1IKbs5Xwa0i" resolve="TVs" />
-                    </node>
+              </node>
+            </node>
+            <node concept="3Aq9E8" id="1IKbs5XzyAl" role="1nLNMd">
+              <node concept="3I6sU6" id="1IKbs5XzyAm" role="3Ip0Jz">
+                <node concept="3I6s7M" id="1IKbs5XzyAn" role="3I6sU7">
+                  <node concept="3wWvb2" id="1IKbs5XzyAo" role="3I6s78">
+                    <node concept="3clFbT" id="1IKbs5XzyAp" role="3wWo3s" />
                   </node>
                 </node>
-                <node concept="3I6s7M" id="1IKbs5Xwa0b" role="3I6sU7">
-                  <node concept="3Aqt3T" id="1IKbs5Xwa0c" role="3I6s78">
+                <node concept="3I6s7M" id="1IKbs5XzyAq" role="3I6sU7">
+                  <node concept="3Aqt3T" id="1IKbs5XzyAr" role="3I6s78">
+                    <ref role="3AqCNq" node="1IKbs5Xj1B1" resolve="checkTypeVarsFail" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="1nLNMY" id="1IKbs5Xw9ST" role="1nK1Vg">
+      <property role="TrG5h" value="tryRenameTypeVars" />
+      <node concept="3clFbS" id="1IKbs5Xw9SU" role="1nLNMH">
+        <node concept="3clFbH" id="1IKbs5XyELC" role="3cqZAp" />
+        <node concept="1nLNNL" id="1IKbs5XyEJP" role="3cqZAp">
+          <node concept="1nLNMm" id="1IKbs5XyEJQ" role="1nLNNK">
+            <node concept="3Aq9E8" id="1IKbs5XyEJR" role="1nLNMd">
+              <node concept="3I6sU6" id="1IKbs5XyEJS" role="3Ip0Jz">
+                <node concept="3I6s7M" id="1IKbs5XyEK2" role="3I6sU7">
+                  <node concept="3Aqt3T" id="1IKbs5XyEK3" role="3I6s78">
                     <ref role="3AqCNq" node="1IKbs5XihHK" resolve="checkTypeVars" />
-                    <node concept="a7P8L" id="1IKbs5Xwa5Y" role="3AunhB">
-                      <ref role="a7OzE" node="1IKbs5Xwa0h" resolve="ITVs" />
+                    <node concept="a7P8L" id="1IKbs5XyEK4" role="3AunhB">
+                      <ref role="a7OzE" node="1IKbs5XyEK8" resolve="ITVs" />
                     </node>
-                    <node concept="a7P8L" id="1IKbs5Xwa66" role="3AunhB">
-                      <ref role="a7OzE" node="1IKbs5Xwa0i" resolve="TVs" />
+                    <node concept="a7P8L" id="1IKbs5XyEK5" role="3AunhB">
+                      <ref role="a7OzE" node="1IKbs5XyEK9" resolve="TVs" />
                     </node>
                   </node>
                 </node>
               </node>
             </node>
-            <node concept="0eUR_" id="1IKbs5Xwa0f" role="0UC6o">
-              <node concept="3NuqgR" id="1IKbs5Xwa0g" role="0eVf_">
-                <node concept="aZer4" id="1IKbs5Xwa0h" role="3XD1gS">
+            <node concept="0eUR_" id="1IKbs5XyEK6" role="0UC6o">
+              <node concept="3NuqgR" id="1IKbs5XyEK7" role="0eVf_">
+                <node concept="aZer4" id="1IKbs5XyEK8" role="3XD1gS">
                   <property role="TrG5h" value="ITVs" />
                 </node>
-                <node concept="aZer4" id="1IKbs5Xwa0i" role="3XD1gS">
+                <node concept="aZer4" id="1IKbs5XyEK9" role="3XD1gS">
                   <property role="TrG5h" value="TVs" />
                 </node>
               </node>
-              <node concept="3NuqgR" id="1IKbs5Xwa0j" role="0eVf_">
-                <node concept="aZer4" id="1IKbs5Xwa0k" role="3XD1gS">
+              <node concept="3NuqgR" id="1IKbs5XyEKa" role="0eVf_">
+                <node concept="aZer4" id="1IKbs5XyEKb" role="3XD1gS">
                   <property role="TrG5h" value="TestITVs" />
                 </node>
               </node>
             </node>
-            <node concept="3Aq93q" id="1IKbs5Xwa0o" role="1nLNMb">
-              <node concept="3I6sU6" id="1IKbs5Xwa0p" role="3Ip0Jz">
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-                  <node concept="3Aqt3T" id="1IKbs5Xwa0r" role="3I6s78">
+            <node concept="3Aq93q" id="1IKbs5XyEKc" role="1nLNMb">
+              <node concept="3I6sU6" id="1IKbs5XyEKd" role="3Ip0Jz">
+                <node concept="3I6s7M" id="1IKbs5XyEKe" role="3I6sU7">
+                  <node concept="3Aqt3T" id="1IKbs5XyEKf" role="3I6s78">
                     <ref role="3AqCNq" node="1IKbs5Xw9SC" resolve="tryRenameTypeVars" />
-                    <node concept="a7P8L" id="1IKbs5Xwa3m" role="3AunhB">
-                      <ref role="a7OzE" node="1IKbs5Xwa0h" resolve="ITVs" />
+                    <node concept="a7P8L" id="1IKbs5XyEKg" role="3AunhB">
+                      <ref role="a7OzE" node="1IKbs5XyEK8" resolve="ITVs" />
                     </node>
-                    <node concept="a7P8L" id="1IKbs5Xwa3s" role="3AunhB">
-                      <ref role="a7OzE" node="1IKbs5Xwa0i" resolve="TVs" />
+                    <node concept="a7P8L" id="1IKbs5XyEKh" role="3AunhB">
+                      <ref role="a7OzE" node="1IKbs5XyEK9" resolve="TVs" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="1X3_iC" id="1IKbs5XyEP4" role="lGtFl">
+          <property role="3V$3am" value="statement" />
+          <property role="3V$3ak" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1068580123136/1068581517665" />
+          <node concept="1nLNNL" id="1IKbs5Xwa00" role="8Wnug">
+            <node concept="1nLNMm" id="1IKbs5Xwa01" role="1nLNNK">
+              <node concept="3Aq9E8" id="1IKbs5Xwa02" role="1nLNMd">
+                <node concept="3I6sU6" id="1IKbs5Xwa03" role="3Ip0Jz">
+                  <node concept="3I6s7M" id="1IKbs5Xwa43" role="3I6sU7">
+                    <node concept="3A8Hvi" id="1IKbs5Xwa3X" role="3I6s78">
+                      <node concept="a7P8L" id="1IKbs5Xwa4c" role="3A8wtg">
+                        <ref role="a7OzE" node="1IKbs5Xwa0k" resolve="TestITVs" />
+                      </node>
+                      <node concept="9KH4l" id="1IKbs5Xwa4h" role="3A8w4Q">
+                        <node concept="a7P8L" id="1IKbs5Xwa4n" role="9KHbC">
+                          <ref role="a7OzE" node="1IKbs5Xwa0h" resolve="ITVs" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3I6s7M" id="1IKbs5Xwa4H" role="3I6sU7">
+                    <node concept="3Aqt3T" id="1IKbs5XwTNi" role="3I6s78">
+                      <ref role="3AqCNq" node="48ZGLP92BQW" resolve="renameTypeVars" />
+                      <node concept="a7P8L" id="1IKbs5XwTNr" role="3AunhB">
+                        <ref role="a7OzE" node="1IKbs5Xwa0k" resolve="TestITVs" />
+                      </node>
+                      <node concept="a7P8L" id="1IKbs5XwTNz" role="3AunhB">
+                        <ref role="a7OzE" node="1IKbs5Xwa0i" resolve="TVs" />
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3I6s7M" id="1IKbs5Xwa0b" role="3I6sU7">
+                    <node concept="3Aqt3T" id="1IKbs5Xwa0c" role="3I6s78">
+                      <ref role="3AqCNq" node="1IKbs5XihHK" resolve="checkTypeVars" />
+                      <node concept="a7P8L" id="1IKbs5Xwa5Y" role="3AunhB">
+                        <ref role="a7OzE" node="1IKbs5Xwa0h" resolve="ITVs" />
+                      </node>
+                      <node concept="a7P8L" id="1IKbs5Xwa66" role="3AunhB">
+                        <ref role="a7OzE" node="1IKbs5Xwa0i" resolve="TVs" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="0eUR_" id="1IKbs5Xwa0f" role="0UC6o">
+                <node concept="3NuqgR" id="1IKbs5Xwa0g" role="0eVf_">
+                  <node concept="aZer4" id="1IKbs5Xwa0h" role="3XD1gS">
+                    <property role="TrG5h" value="ITVs" />
+                  </node>
+                  <node concept="aZer4" id="1IKbs5Xwa0i" role="3XD1gS">
+                    <property role="TrG5h" value="TVs" />
+                  </node>
+                </node>
+                <node concept="3NuqgR" id="1IKbs5Xwa0j" role="0eVf_">
+                  <node concept="aZer4" id="1IKbs5Xwa0k" role="3XD1gS">
+                    <property role="TrG5h" value="TestITVs" />
+                  </node>
+                </node>
+              </node>
+              <node concept="3Aq93q" id="1IKbs5Xwa0o" role="1nLNMb">
+                <node concept="3I6sU6" id="1IKbs5Xwa0p" role="3Ip0Jz">
+                  <node concept="3I6s7M" id="1IKbs5Xwa0q" role="3I6sU7">
+                    <node concept="3Aqt3T" id="1IKbs5Xwa0r" role="3I6s78">
+                      <ref role="3AqCNq" node="1IKbs5Xw9SC" resolve="tryRenameTypeVars" />
+                      <node concept="a7P8L" id="1IKbs5Xwa3m" role="3AunhB">
+                        <ref role="a7OzE" node="1IKbs5Xwa0h" resolve="ITVs" />
+                      </node>
+                      <node concept="a7P8L" id="1IKbs5Xwa3s" role="3AunhB">
+                        <ref role="a7OzE" node="1IKbs5Xwa0i" resolve="TVs" />
+                      </node>
                     </node>
                   </node>
                 </node>
@@ -8129,84 +8290,109 @@
         </node>
       </node>
     </node>
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-                <node concept="aZer4" id="1IKbs5Xj1lT" role="3XD1gS">
-                  <property role="TrG5h" value="OrigTVar" />
+    <node concept="1nLNMY" id="48ZGLP92BFZ" role="1nK1Vg">
+      <property role="TrG5h" value="subsumes_Forall_left" />
+      <node concept="3clFbS" id="48ZGLP92BG0" role="1nLNMH">
+        <node concept="1nLNNL" id="48ZGLP8pG8z" role="3cqZAp">
+          <node concept="1nLNMm" id="48ZGLP8pG8$" role="1nLNNK">
+            <node concept="0eUR_" id="48ZGLP8pG8_" role="0UC6o">
+              <node concept="3NuqgR" id="48ZGLP8pG8A" role="0eVf_">
+                <node concept="aZer4" id="48ZGLP8pG8C" role="3XD1gS">
+                  <property role="TrG5h" value="F" />
                 </node>
-                <node concept="aZer4" id="1IKbs5Xj1lU" role="3XD1gS">
-                  <property role="TrG5h" value="TVar" />
+                <node concept="aZer4" id="48ZGLP8pG8D" role="3XD1gS">
+                  <property role="TrG5h" value="T" />
                 </node>
-                <node concept="aZer4" id="1IKbs5Xj1lV" role="3XD1gS">
-                  <property role="TrG5h" value="TVsTail" />
+                <node concept="aZer4" id="48ZGLP8pG8E" role="3XD1gS">
+                  <property role="TrG5h" value="TVs" />
                 </node>
-                <node concept="aZer4" id="1IKbs5Xj1lW" role="3XD1gS">
-                  <property role="TrG5h" value="ITVsTail" />
+              </node>
+              <node concept="3NuqgR" id="48ZGLP8pGjv" role="0eVf_">
+                <node concept="aZer4" id="48ZGLP8pGjw" role="3XD1gS">
+                  <property role="TrG5h" value="R" />
+                </node>
+              </node>
+              <node concept="3NuqgR" id="48ZGLP8pH75" role="0eVf_">
+                <node concept="aZer4" id="48ZGLP8pH76" role="3XD1gS">
+                  <property role="TrG5h" value="I" />
+                </node>
+                <node concept="aZer4" id="48ZGLP8pH7l" role="3XD1gS">
+                  <property role="TrG5h" value="ITVs" />
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-                          <node concept="a7P8L" id="1IKbs5Xj1m6" role="1nq8_t">
-                            <ref role="a7OzE" node="1IKbs5Xj1lU" resolve="TVar" />
+            <node concept="3Aq93q" id="48ZGLP8pG8F" role="1nLNMb">
+              <node concept="3I6sU6" id="48ZGLP8pG8G" role="3Ip0Jz">
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+                    <ref role="3AqCNq" node="48ZGLP8pG4u" />
+                    <node concept="1HFMs5" id="48ZGLP8pG8J" role="3AunhB">
+                      <node concept="a7P8L" id="48ZGLP8pG8K" role="1uarlU">
+                        <ref role="a7OzE" node="48ZGLP8pG8C" />
+                      </node>
+                      <node concept="ns1u0" id="48ZGLP8pG8L" role="1uarlW">
+                        <ref role="ns1xF" node="7VBaGntJSG6" />
+                        <node concept="nsMwS" id="48ZGLP8pG8M" role="ns1xD">
+                          <ref role="nsMwP" node="7VBaGntJSG8" />
+                          <node concept="1nq8_$" id="48ZGLP8pG8N" role="nsMwV">
+                            <node concept="a7P8L" id="48ZGLP8pG8O" role="1nq8_t">
+                              <ref role="a7OzE" node="48ZGLP8pG8D" />
+                            </node>
                           </node>
                         </node>
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-                      <node concept="nsMwS" id="1IKbs5Xj1m7" role="ns1xD">
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-                          <node concept="a7P8L" id="1IKbs5Xj1m9" role="1nq8_t">
-                            <ref role="a7OzE" node="1IKbs5Xj1lW" resolve="ITVsTail" />
+                        <node concept="nsMwS" id="48ZGLP8pG8P" role="ns1xD">
+                          <ref role="nsMwP" node="48ZGLP7pnre" />
+                          <node concept="1nq8_$" id="48ZGLP8pG8Q" role="nsMwV">
+                            <node concept="a7P8L" id="48ZGLP8pG8R" role="1nq8_t">
+                              <ref role="a7OzE" node="48ZGLP8pG8E" />
+                            </node>
                           </node>
                         </node>
                       </node>
                     </node>
-                    <node concept="ns1u0" id="1IKbs5Xj1mc" role="3AunhB">
-                      <ref role="ns1xF" node="48ZGLP7pl6j" resolve="Cons" />
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-                          <node concept="a7P8L" id="1IKbs5Xj1mf" role="1nq8_t">
-                            <ref role="a7OzE" node="1IKbs5Xj1lT" resolve="OrigTVar" />
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-                          <node concept="a7P8L" id="1IKbs5Xj1mi" role="1nq8_t">
-                            <ref role="a7OzE" node="1IKbs5Xj1lV" resolve="TVsTail" />
-                          </node>
-                        </node>
-                      </node>
+                    <node concept="a7P8L" id="48ZGLP8pGkl" role="3AunhB">
+                      <ref role="a7OzE" node="48ZGLP8pGjw" />
                     </node>
                   </node>
                 </node>
               </node>
             </node>
-            <node concept="3Aq9E8" id="1IKbs5Xj1mj" role="1nLNMd">
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-                    <node concept="3clFbT" id="1IKbs5Xj1AW" role="3wWo3s" />
+            <node concept="3Aq9E8" id="48ZGLP8pGkz" role="1nLNMd">
+              <node concept="3I6sU6" id="48ZGLP8pGk$" role="3Ip0Jz">
+                <node concept="3I6s7M" id="1IKbs5XviIb" role="3I6sU7">
+                  <node concept="3Aqt3T" id="48ZGLP8pH71" role="3I6s78">
+                    <ref role="3AqCNq" node="12dHl3ZCEx3" />
+                    <node concept="a7P8L" id="48ZGLP8pH7B" role="3AunhB">
+                      <ref role="a7OzE" node="48ZGLP8pH76" />
+                    </node>
+                    <node concept="a7P8L" id="48ZGLP8pH7M" role="3AunhB">
+                      <ref role="a7OzE" node="48ZGLP8pG8C" />
+                    </node>
+                    <node concept="a7P8L" id="48ZGLP8pH7T" role="3AunhB">
+                      <ref role="a7OzE" node="48ZGLP8pH7l" />
+                    </node>
                   </node>
                 </node>
-                <node concept="3I6s7M" id="1IKbs5Xj1Bs" role="3I6sU7">
-                  <node concept="3Aqt3T" id="1IKbs5Xj1Bq" role="3I6s78">
-                    <ref role="3AqCNq" node="1IKbs5Xj1B1" resolve="checkTypeVarsFail" />
+                <node concept="3I6s7M" id="1IKbs5XviIc" role="3I6sU7">
+                  <node concept="3Aqt3T" id="48ZGLP8pH87" role="3I6s78">
+                    <ref role="3AqCNq" node="48ZGLP8pG4u" />
+                    <node concept="a7P8L" id="48ZGLP8pH8h" role="3AunhB">
+                      <ref role="a7OzE" node="48ZGLP8pH76" />
+                    </node>
+                    <node concept="a7P8L" id="48ZGLP8pH8o" role="3AunhB">
+                      <ref role="a7OzE" node="48ZGLP8pGjw" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="3I6s7M" id="1IKbs5XviId" role="3I6sU7">
+                  <node concept="3Aqt3T" id="PORTCHCQNV" role="3I6s78">
+                    <ref role="3AqCNq" node="48ZGLP92BQW" resolve="renameTypeVars" />
+                    <node concept="a7P8L" id="PORTCHCQO9" role="3AunhB">
+                      <ref role="a7OzE" node="48ZGLP8pH7l" />
+                    </node>
+                    <node concept="a7P8L" id="PORTCHCQOg" role="3AunhB">
+                      <ref role="a7OzE" node="48ZGLP8pG8E" />
+                    </node>
                   </node>
                 </node>
               </node>
@@ -8311,7 +8497,7 @@
                 </node>
                 <node concept="3I6s7M" id="48ZGLP92BRc" role="3I6sU7">
                   <node concept="3Aqt3T" id="48ZGLP92BRa" role="3I6s78">
-                    <ref role="3AqCNq" node="48ZGLP92BQW" resolve="renameTypeVars" />
+                    <ref role="3AqCNq" node="1IKbs5Xw9SC" resolve="tryRenameTypeVars" />
                     <node concept="a7P8L" id="48ZGLP92BRq" role="3AunhB">
                       <ref role="a7OzE" node="48ZGLP8pI8i" resolve="ITVs" />
                     </node>
@@ -8326,117 +8512,6 @@
         </node>
       </node>
     </node>
-    <node concept="1nLNMY" id="48ZGLP92BFZ" role="1nK1Vg">
-      <property role="TrG5h" value="subsumes_Forall_left" />
-      <node concept="3clFbS" id="48ZGLP92BG0" role="1nLNMH">
-        <node concept="1nLNNL" id="48ZGLP8pG8z" role="3cqZAp">
-          <node concept="1nLNMm" id="48ZGLP8pG8$" role="1nLNNK">
-            <node concept="0eUR_" id="48ZGLP8pG8_" role="0UC6o">
-              <node concept="3NuqgR" id="48ZGLP8pG8A" role="0eVf_">
-                <node concept="aZer4" id="48ZGLP8pG8C" role="3XD1gS">
-                  <property role="TrG5h" value="F" />
-                </node>
-                <node concept="aZer4" id="48ZGLP8pG8D" role="3XD1gS">
-                  <property role="TrG5h" value="T" />
-                </node>
-                <node concept="aZer4" id="48ZGLP8pG8E" role="3XD1gS">
-                  <property role="TrG5h" value="TVs" />
-                </node>
-              </node>
-              <node concept="3NuqgR" id="48ZGLP8pGjv" role="0eVf_">
-                <node concept="aZer4" id="48ZGLP8pGjw" role="3XD1gS">
-                  <property role="TrG5h" value="R" />
-                </node>
-              </node>
-              <node concept="3NuqgR" id="48ZGLP8pH75" role="0eVf_">
-                <node concept="aZer4" id="48ZGLP8pH76" role="3XD1gS">
-                  <property role="TrG5h" value="I" />
-                </node>
-                <node concept="aZer4" id="48ZGLP8pH7l" role="3XD1gS">
-                  <property role="TrG5h" value="ITVs" />
-                </node>
-              </node>
-            </node>
-            <node concept="3Aq93q" id="48ZGLP8pG8F" role="1nLNMb">
-              <node concept="3I6sU6" id="48ZGLP8pG8G" role="3Ip0Jz">
-                <node concept="3I6s7M" id="48ZGLP8pG8H" role="3I6sU7">
-                  <node concept="3Aqt3T" id="48ZGLP8pG8I" role="3I6s78">
-                    <ref role="3AqCNq" node="48ZGLP8pG4u" />
-                    <node concept="1HFMs5" id="48ZGLP8pG8J" role="3AunhB">
-                      <node concept="a7P8L" id="48ZGLP8pG8K" role="1uarlU">
-                        <ref role="a7OzE" node="48ZGLP8pG8C" />
-                      </node>
-                      <node concept="ns1u0" id="48ZGLP8pG8L" role="1uarlW">
-                        <ref role="ns1xF" node="7VBaGntJSG6" />
-                        <node concept="nsMwS" id="48ZGLP8pG8M" role="ns1xD">
-                          <ref role="nsMwP" node="7VBaGntJSG8" />
-                          <node concept="1nq8_$" id="48ZGLP8pG8N" role="nsMwV">
-                            <node concept="a7P8L" id="48ZGLP8pG8O" role="1nq8_t">
-                              <ref role="a7OzE" node="48ZGLP8pG8D" />
-                            </node>
-                          </node>
-                        </node>
-                        <node concept="nsMwS" id="48ZGLP8pG8P" role="ns1xD">
-                          <ref role="nsMwP" node="48ZGLP7pnre" />
-                          <node concept="1nq8_$" id="48ZGLP8pG8Q" role="nsMwV">
-                            <node concept="a7P8L" id="48ZGLP8pG8R" role="1nq8_t">
-                              <ref role="a7OzE" node="48ZGLP8pG8E" />
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-                          </node>
-                        </node>
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-                <node concept="3I6s7M" id="1IKbs5XviIb" role="3I6sU7">
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-                      <ref role="a7OzE" node="48ZGLP8pH76" />
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-                    <node concept="a7P8L" id="48ZGLP8pH7M" role="3AunhB">
-                      <ref role="a7OzE" node="48ZGLP8pG8C" />
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-                    <node concept="a7P8L" id="48ZGLP8pH7T" role="3AunhB">
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-                <node concept="3I6s7M" id="1IKbs5XviIc" role="3I6sU7">
-                  <node concept="3Aqt3T" id="48ZGLP8pH87" role="3I6s78">
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-                    <node concept="a7P8L" id="48ZGLP8pH8o" role="3AunhB">
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-                <node concept="3I6s7M" id="1IKbs5XviId" role="3I6sU7">
-                  <node concept="3Aqt3T" id="PORTCHCQNV" role="3I6s78">
-                    <ref role="3AqCNq" node="1IKbs5Xw9SC" />
-                    <node concept="a7P8L" id="PORTCHCQO9" role="3AunhB">
-                      <ref role="a7OzE" node="48ZGLP8pH7l" />
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-                    <node concept="a7P8L" id="PORTCHCQOg" role="3AunhB">
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-              </node>
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-      </node>
-    </node>
     <node concept="1nLNMY" id="48ZGLP8pGcD" role="1nK1Vg">
       <property role="TrG5h" value="subsumes_Fun" />
       <node concept="3clFbS" id="48ZGLP8pGcE" role="1nLNMH">
@@ -8771,26 +8846,95 @@
         </node>
       </node>
     </node>
-    <node concept="3AqmO8" id="1IKbs5Xw9SC" role="8PkJo">
-      <property role="TrG5h" value="tryRenameTypeVars" />
-      <node concept="1zAUYm" id="1IKbs5Xw9SD" role="1zAUyy">
-        <property role="TrG5h" value="toRename" />
+    <node concept="1X3_iC" id="1IKbs5X$4ZI" role="lGtFl">
+      <property role="3V$3am" value="template" />
+      <property role="3V$3ak" value="c4803b19-6d89-4a3b-bf82-390769514add/8335224865066015764/3575255234175157601" />
+      <node concept="1nLNMY" id="1IKbs5Xj1lK" role="8Wnug">
+        <property role="TrG5h" value="checkTypeVars_fail" />
+        <node concept="3clFbS" id="1IKbs5Xj1lL" role="1nLNMH">
+          <node concept="1nLNNL" id="1IKbs5Xj1lM" role="3cqZAp">
+            <node concept="1nLNMm" id="1IKbs5Xj1lN" role="1nLNNK">
+              <node concept="0eUR_" id="1IKbs5Xj1lO" role="0UC6o">
+                <node concept="3NuqgR" id="1IKbs5Xj1lS" role="0eVf_">
+                  <node concept="aZer4" id="1IKbs5Xj1lT" role="3XD1gS">
+                    <property role="TrG5h" value="OrigTVar" />
+                  </node>
+                  <node concept="aZer4" id="1IKbs5Xj1lU" role="3XD1gS">
+                    <property role="TrG5h" value="TVar" />
+                  </node>
+                  <node concept="aZer4" id="1IKbs5Xj1lV" role="3XD1gS">
+                    <property role="TrG5h" value="TVsTail" />
+                  </node>
+                  <node concept="aZer4" id="1IKbs5Xj1lW" role="3XD1gS">
+                    <property role="TrG5h" value="ITVsTail" />
+                  </node>
+                </node>
+              </node>
+              <node concept="3Aq93q" id="1IKbs5Xj1lX" role="1nLNMb">
+                <node concept="3I6sU6" id="1IKbs5Xj1lY" role="3Ip0Jz">
+                  <node concept="3I6s7M" id="1IKbs5Xj1lZ" role="3I6sU7">
+                    <node concept="3Aqt3T" id="1IKbs5Xj1m0" role="3I6s78">
+                      <ref role="3AqCNq" node="1IKbs5XihHK" resolve="checkTypeVars" />
+                      <node concept="ns1u0" id="1IKbs5Xj1m3" role="3AunhB">
+                        <ref role="ns1xF" node="48ZGLP7pl6j" resolve="Cons" />
+                        <node concept="nsMwS" id="1IKbs5Xj1m4" role="ns1xD">
+                          <ref role="nsMwP" node="48ZGLP7pl6$" resolve="head" />
+                          <node concept="1nq8_$" id="1IKbs5Xj1m5" role="nsMwV">
+                            <node concept="a7P8L" id="1IKbs5Xj1m6" role="1nq8_t">
+                              <ref role="a7OzE" node="1IKbs5Xj1lU" resolve="TVar" />
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="nsMwS" id="1IKbs5Xj1m7" role="ns1xD">
+                          <ref role="nsMwP" node="48ZGLP7pl6J" resolve="tail" />
+                          <node concept="1nq8_$" id="1IKbs5Xj1m8" role="nsMwV">
+                            <node concept="a7P8L" id="1IKbs5Xj1m9" role="1nq8_t">
+                              <ref role="a7OzE" node="1IKbs5Xj1lW" resolve="ITVsTail" />
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="ns1u0" id="1IKbs5Xj1mc" role="3AunhB">
+                        <ref role="ns1xF" node="48ZGLP7pl6j" resolve="Cons" />
+                        <node concept="nsMwS" id="1IKbs5Xj1md" role="ns1xD">
+                          <ref role="nsMwP" node="48ZGLP7pl6$" resolve="head" />
+                          <node concept="1nq8_$" id="1IKbs5Xj1me" role="nsMwV">
+                            <node concept="a7P8L" id="1IKbs5Xj1mf" role="1nq8_t">
+                              <ref role="a7OzE" node="1IKbs5Xj1lT" resolve="OrigTVar" />
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="nsMwS" id="1IKbs5Xj1mg" role="ns1xD">
+                          <ref role="nsMwP" node="48ZGLP7pl6J" resolve="tail" />
+                          <node concept="1nq8_$" id="1IKbs5Xj1mh" role="nsMwV">
+                            <node concept="a7P8L" id="1IKbs5Xj1mi" role="1nq8_t">
+                              <ref role="a7OzE" node="1IKbs5Xj1lV" resolve="TVsTail" />
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3Aq9E8" id="1IKbs5Xj1mj" role="1nLNMd">
+                <node concept="3I6sU6" id="1IKbs5Xj1mk" role="3Ip0Jz">
+                  <node concept="3I6s7M" id="1IKbs5Xj1ml" role="3I6sU7">
+                    <node concept="3wWvb2" id="1IKbs5Xj1AT" role="3I6s78">
+                      <node concept="3clFbT" id="1IKbs5Xj1AW" role="3wWo3s" />
+                    </node>
+                  </node>
+                  <node concept="3I6s7M" id="1IKbs5Xj1Bs" role="3I6sU7">
+                    <node concept="3Aqt3T" id="1IKbs5Xj1Bq" role="3I6s78">
+                      <ref role="3AqCNq" node="1IKbs5Xj1B1" resolve="checkTypeVarsFail" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
       </node>
-      <node concept="1zAUYm" id="1IKbs5Xw9SE" role="1zAUyy">
-        <property role="TrG5h" value="originalTypeVars" />
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-      <node concept="1zAUYm" id="1IKbs5XihHW" role="1zAUyy">
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-    <node concept="3AqmO8" id="1IKbs5Xj1B1" role="8PkJo">
-      <property role="TrG5h" value="checkTypeVarsFail" />
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   </node>
   <node concept="AVZre" id="48ZGLP8vr$a">
@@ -10153,6 +10297,155 @@
         </node>
       </node>
     </node>
+    <node concept="1X3_iC" id="1IKbs5X$BkG" role="lGtFl">
+      <property role="3V$3am" value="template" />
+      <property role="3V$3ak" value="c4803b19-6d89-4a3b-bf82-390769514add/8335224865066015764/3575255234175157601" />
+      <node concept="1nLNMY" id="1IKbs5X$yvi" role="8Wnug">
+        <property role="TrG5h" value="typeOf_AnnVarRef" />
+        <node concept="3clFbS" id="1IKbs5X$yvj" role="1nLNMH">
+          <node concept="3cpWs8" id="1IKbs5X$$Vr" role="3cqZAp">
+            <node concept="3cpWsn" id="1IKbs5X$$Vu" role="3cpWs9">
+              <property role="TrG5h" value="varRef" />
+              <node concept="3Tqbb2" id="1IKbs5X$$Vp" role="1tU5fm">
+                <ref role="ehGHo" to="8tt8:7_zMfd$ooor" resolve="VarRef" />
+              </node>
+              <node concept="1PxgMI" id="1IKbs5X$AiQ" role="33vP2m">
+                <node concept="chp4Y" id="1IKbs5X$AEG" role="3oSUPX">
+                  <ref role="cht4Q" to="8tt8:7_zMfd$ooor" resolve="VarRef" />
+                </node>
+                <node concept="2OqwBi" id="1IKbs5X$_7d" role="1m5AlR">
+                  <node concept="3A2sRY" id="1IKbs5X$$VX" role="2Oq$k0">
+                    <ref role="3A2yKK" node="1IKbs5X$yDy" resolve="annVarRef" />
+                  </node>
+                  <node concept="3TrEf2" id="1IKbs5X$_Eq" role="2OqNvi">
+                    <ref role="3Tt5mk" to="8tt8:JqEP$8fvqp" resolve="expr" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
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diff --git a/samples/lambdacalc/solutions/samples.lambdacalc.demo/models/samples.lambdacalc.demo.mps b/samples/lambdacalc/solutions/samples.lambdacalc.demo/models/samples.lambdacalc.demo.mps
index 504af8a3..dbc9495f 100644
--- a/samples/lambdacalc/solutions/samples.lambdacalc.demo/models/samples.lambdacalc.demo.mps
+++ b/samples/lambdacalc/solutions/samples.lambdacalc.demo/models/samples.lambdacalc.demo.mps
@@ -1944,6 +1944,60 @@
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