diff --git a/coderules/solutions/jetbrains.mps.coderules/models/service.mps b/coderules/solutions/jetbrains.mps.coderules/models/service.mps
index 93cc7779..f8d9929e 100644
--- a/coderules/solutions/jetbrains.mps.coderules/models/service.mps
+++ b/coderules/solutions/jetbrains.mps.coderules/models/service.mps
@@ -4834,92 +4834,17 @@
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@@ -5070,227 +4995,227 @@
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-                                <property role="3oM_SC" value="failures" />
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                                 <ref role="37wK5l" to="31yc:2mhJggjv0WN" resolve="get" />
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+                                  <ref role="37wK5l" to="et5u:~Message.createMessage(jetbrains.mps.messages.MessageKind,java.lang.String,java.lang.String,java.lang.Throwable)" resolve="createMessage" />
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                                     <ref role="1Px2BO" to="et5u:~MessageKind" resolve="MessageKind" />
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-                                  <ref role="37wK5l" to="31yc:2mhJggjv0WN" resolve="get" />
+                            <node concept="3clFbH" id="2Y70AYEai$0" role="3cqZAp" />
+                            <node concept="3clFbF" id="2Y70AYEaaRb" role="3cqZAp">
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+                                <node concept="2YIFZM" id="2Y70AYEaaRd" role="2Oq$k0">
                                   <ref role="1Pybhc" to="31yc:4MaHsBDdlvx" resolve="MessageLog" />
+                                  <ref role="37wK5l" to="31yc:2mhJggjv0WN" resolve="get" />
                                 </node>
-                                <node concept="liA8E" id="2mhJggjvle1" role="2OqNvi">
+                                <node concept="liA8E" id="2Y70AYEaaRe" role="2OqNvi">
                                   <ref role="37wK5l" to="31yc:4MaHsBDgiaT" resolve="handle" />
-                                  <node concept="2YIFZM" id="2mhJggjvlBX" role="37wK5m">
-                                    <ref role="1Pybhc" to="et5u:~Message" resolve="Message" />
+                                  <node concept="2YIFZM" id="2Y70AYEaaRf" role="37wK5m">
                                     <ref role="37wK5l" to="et5u:~Message.createMessage(jetbrains.mps.messages.MessageKind,java.lang.String,java.lang.String,java.lang.Throwable)" resolve="createMessage" />
-                                    <node concept="Rm8GO" id="2mhJggjvmgQ" role="37wK5m">
+                                    <ref role="1Pybhc" to="et5u:~Message" resolve="Message" />
+                                    <node concept="Rm8GO" id="2Y70AYEado8" role="37wK5m">
+                                      <ref role="Rm8GQ" to="et5u:~MessageKind.ERROR" resolve="ERROR" />
                                       <ref role="1Px2BO" to="et5u:~MessageKind" resolve="MessageKind" />
-                                      <ref role="Rm8GQ" to="et5u:~MessageKind.WARNING" resolve="WARNING" />
                                     </node>
-                                    <node concept="2OqwBi" id="2mhJggjvoqg" role="37wK5m">
-                                      <node concept="3VsKOn" id="2mhJggjvo4e" role="2Oq$k0">
+                                    <node concept="2OqwBi" id="2Y70AYEaaRh" role="37wK5m">
+                                      <node concept="3VsKOn" id="2Y70AYEaaRi" role="2Oq$k0">
                                         <ref role="3VsUkX" node="1pPth$l_TFV" resolve="CoderulesHelper" />
                                       </node>
-                                      <node concept="liA8E" id="2mhJggj_jX5" role="2OqNvi">
+                                      <node concept="liA8E" id="2Y70AYEaaRj" role="2OqNvi">
                                         <ref role="37wK5l" to="wyt6:~Class.getSimpleName()" resolve="getSimpleName" />
                                       </node>
                                     </node>
-                                    <node concept="Xl_RD" id="2mhJggjvms9" role="37wK5m">
-                                      <property role="Xl_RC" value="resuming after error" />
+                                    <node concept="Xl_RD" id="2Y70AYEaaRk" role="37wK5m">
+                                      <property role="Xl_RC" value="double error" />
                                     </node>
-                                    <node concept="37vLTw" id="2Y70AYEaahj" role="37wK5m">
-                                      <ref role="3cqZAo" node="4BHjwwGLj1I" resolve="cause" />
+                                    <node concept="37vLTw" id="2Y70AYEahX3" role="37wK5m">
+                                      <ref role="3cqZAo" node="4BHjwwGKJA$" resolve="failure" />
                                     </node>
                                   </node>
                                 </node>
                               </node>
                             </node>
-                            <node concept="3clFbH" id="2Y70AYEa7FV" role="3cqZAp" />
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-                                <node concept="37vLTw" id="4BHjwwGLkda" role="37vLTx">
-                                  <ref role="3cqZAo" node="4BHjwwGLj1I" resolve="cause" />
-                                </node>
-                                <node concept="2OqwBi" id="4BHjwwGL59H" role="37vLTJ">
-                                  <node concept="Xjq3P" id="4BHjwwGL4R5" role="2Oq$k0" />
-                                  <node concept="2OwXpG" id="4BHjwwGL5uh" role="2OqNvi">
-                                    <ref role="2Oxat5" node="4BHjwwGKJA$" resolve="failure" />
-                                  </node>
-                                </node>
-                              </node>
-                            </node>
-                            <node concept="3cpWs8" id="6kREIVkKnAM" role="3cqZAp">
-                              <node concept="3cpWsn" id="6kREIVkKnAN" role="3cpWs9">
-                                <property role="TrG5h" value="effect" />
-                                <node concept="2OqwBi" id="6kREIVkKnAQ" role="33vP2m">
-                                  <node concept="37vLTw" id="6kREIVkKnAR" role="2Oq$k0">
-                                    <ref role="3cqZAo" node="6kREIVkerkd" resolve="resume" />
-                                  </node>
-                                  <node concept="liA8E" id="6kREIVkKnAS" role="2OqNvi">
-                                    <ref role="37wK5l" node="6kREIVk5cLq" resolve="failedEffect" />
-                                  </node>
-                                </node>
-                                <node concept="3uibUv" id="2daneBQ9054" role="1tU5fm">
-                                  <ref role="3uigEE" node="2daneBOWXQd" resolve="Effect" />
-                                  <node concept="3qTvmN" id="2daneBQ91ak" role="11_B2D" />
-                                </node>
-                              </node>
-                            </node>
-                            <node concept="3clFbF" id="6kREIVkjYWz" role="3cqZAp">
-                              <node concept="1rXfSq" id="6kREIVkjYWx" role="3clFbG">
+                            <node concept="3clFbH" id="2Y70AYEaaQz" role="3cqZAp" />
+                            <node concept="3clFbF" id="5lxnBcU2yds" role="3cqZAp">
+                              <node concept="1rXfSq" id="5lxnBcU2ydt" role="3clFbG">
                                 <ref role="37wK5l" node="7dgRGU4MD7E" resolve="feedback" />
-                                <node concept="37vLTw" id="6kREIVkKo$_" role="37wK5m">
-                                  <ref role="3cqZAo" node="6kREIVkKnAN" resolve="effect" />
-                                </node>
-                                <node concept="3clFbT" id="6kREIVkjZEr" role="37wK5m">
+                                <node concept="10Nm6u" id="5lxnBcU2y_t" role="37wK5m" />
+                                <node concept="3clFbT" id="5lxnBcU2ydv" role="37wK5m">
                                   <property role="3clFbU" value="false" />
                                 </node>
-                                <node concept="2OqwBi" id="6kREIVkk1ym" role="37wK5m">
-                                  <node concept="37vLTw" id="6kREIVkk1ip" role="2Oq$k0">
+                                <node concept="2OqwBi" id="5lxnBcU2ydw" role="37wK5m">
+                                  <node concept="37vLTw" id="5lxnBcU2ydx" role="2Oq$k0">
                                     <ref role="3cqZAo" node="6kREIVkftXC" resolve="t" />
                                   </node>
-                                  <node concept="liA8E" id="6kREIVkk1YN" role="2OqNvi">
+                                  <node concept="liA8E" id="5lxnBcU2ydy" role="2OqNvi">
                                     <ref role="37wK5l" to="wyt6:~Throwable.getMessage()" resolve="getMessage" />
                                   </node>
                                 </node>
                               </node>
                             </node>
-                            <node concept="3cpWs6" id="6kREIVkerkj" role="3cqZAp">
-                              <node concept="37vLTw" id="6kREIVkKnAT" role="3cqZAk">
-                                <ref role="3cqZAo" node="6kREIVkKnAN" resolve="effect" />
+                            <node concept="3clFbH" id="2Y70AYEajy$" role="3cqZAp" />
+                            <node concept="3clFbJ" id="4BHjwwGLNrc" role="3cqZAp">
+                              <node concept="3clFbS" id="4BHjwwGLNre" role="3clFbx">
+                                <node concept="YS8fn" id="4BHjwwGLiJF" role="3cqZAp">
+                                  <node concept="1eOMI4" id="4BHjwwGMb2S" role="YScLw">
+                                    <node concept="10QFUN" id="4BHjwwGMb2P" role="1eOMHV">
+                                      <node concept="3uibUv" id="4BHjwwGMb2U" role="10QFUM">
+                                        <ref role="3uigEE" to="wyt6:~Exception" resolve="Exception" />
+                                      </node>
+                                      <node concept="37vLTw" id="4BHjwwGMb2V" role="10QFUP">
+                                        <ref role="3cqZAo" node="4BHjwwGLj1I" resolve="cause" />
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
+                                <node concept="3clFbH" id="4BHjwwGMbh6" role="3cqZAp" />
+                              </node>
+                              <node concept="2ZW3vV" id="4BHjwwGLOxy" role="3clFbw">
+                                <node concept="3uibUv" id="4BHjwwGLOQs" role="2ZW6by">
+                                  <ref role="3uigEE" to="wyt6:~Exception" resolve="Exception" />
+                                </node>
+                                <node concept="37vLTw" id="4BHjwwGLNG3" role="2ZW6bz">
+                                  <ref role="3cqZAo" node="4BHjwwGLj1I" resolve="cause" />
+                                </node>
+                              </node>
+                              <node concept="9aQIb" id="4BHjwwGLPyb" role="9aQIa">
+                                <node concept="3clFbS" id="4BHjwwGLPyc" role="9aQI4">
+                                  <node concept="YS8fn" id="4BHjwwGLPO5" role="3cqZAp">
+                                    <node concept="2ShNRf" id="4BHjwwGLQ56" role="YScLw">
+                                      <node concept="1pGfFk" id="4BHjwwGLR4t" role="2ShVmc">
+                                        <ref role="37wK5l" to="wyt6:~RuntimeException.&lt;init&gt;(java.lang.String,java.lang.Throwable)" resolve="RuntimeException" />
+                                        <node concept="Xl_RD" id="4BHjwwGLRlw" role="37wK5m">
+                                          <property role="Xl_RC" value="unexpected failure" />
+                                        </node>
+                                        <node concept="37vLTw" id="4BHjwwGLSC4" role="37wK5m">
+                                          <ref role="3cqZAo" node="4BHjwwGLj1I" resolve="cause" />
+                                        </node>
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
                               </node>
                             </node>
                           </node>
@@ -5308,40 +5233,6 @@
                     </node>
                     <node concept="9aQIb" id="6kREIVl2wQO" role="9aQIa">
                       <node concept="3clFbS" id="6kREIVl2wQP" role="9aQI4">
-                        <node concept="3clFbF" id="2Y70AYEak2B" role="3cqZAp">
-                          <node concept="2OqwBi" id="2Y70AYEak2C" role="3clFbG">
-                            <node concept="2YIFZM" id="2Y70AYEak2D" role="2Oq$k0">
-                              <ref role="1Pybhc" to="31yc:4MaHsBDdlvx" resolve="MessageLog" />
-                              <ref role="37wK5l" to="31yc:2mhJggjv0WN" resolve="get" />
-                            </node>
-                            <node concept="liA8E" id="2Y70AYEak2E" role="2OqNvi">
-                              <ref role="37wK5l" to="31yc:4MaHsBDgiaT" resolve="handle" />
-                              <node concept="2YIFZM" id="2Y70AYEak2F" role="37wK5m">
-                                <ref role="1Pybhc" to="et5u:~Message" resolve="Message" />
-                                <ref role="37wK5l" to="et5u:~Message.createMessage(jetbrains.mps.messages.MessageKind,java.lang.String,java.lang.String,java.lang.Throwable)" resolve="createMessage" />
-                                <node concept="Rm8GO" id="2Y70AYEamwi" role="37wK5m">
-                                  <ref role="Rm8GQ" to="et5u:~MessageKind.ERROR" resolve="ERROR" />
-                                  <ref role="1Px2BO" to="et5u:~MessageKind" resolve="MessageKind" />
-                                </node>
-                                <node concept="2OqwBi" id="2Y70AYEak2H" role="37wK5m">
-                                  <node concept="3VsKOn" id="2Y70AYEak2I" role="2Oq$k0">
-                                    <ref role="3VsUkX" node="1pPth$l_TFV" resolve="CoderulesHelper" />
-                                  </node>
-                                  <node concept="liA8E" id="2Y70AYEak2J" role="2OqNvi">
-                                    <ref role="37wK5l" to="wyt6:~Class.getSimpleName()" resolve="getSimpleName" />
-                                  </node>
-                                </node>
-                                <node concept="Xl_RD" id="2Y70AYEak2K" role="37wK5m">
-                                  <property role="Xl_RC" value="error" />
-                                </node>
-                                <node concept="37vLTw" id="2Y70AYEaojF" role="37wK5m">
-                                  <ref role="3cqZAo" node="6kREIVkftXC" resolve="t" />
-                                </node>
-                              </node>
-                            </node>
-                          </node>
-                        </node>
-                        <node concept="3clFbH" id="2Y70AYEak1R" role="3cqZAp" />
                         <node concept="3clFbF" id="5lxnBcU2zaT" role="3cqZAp">
                           <node concept="1rXfSq" id="5lxnBcU2zaU" role="3clFbG">
                             <ref role="37wK5l" node="7dgRGU4MD7E" resolve="feedback" />
@@ -5460,6 +5351,147 @@
         </node>
       </node>
     </node>
+    <node concept="2tJIrI" id="2EeqUFatn6M" role="jymVt" />
+    <node concept="3clFb_" id="2EeqUFats5_" role="jymVt">
+      <property role="TrG5h" value="fail" />
+      <node concept="37vLTG" id="2EeqUFatCnr" role="3clF46">
+        <property role="TrG5h" value="input" />
+        <node concept="3uibUv" id="2EeqUFatG5Z" role="1tU5fm">
+          <ref role="3uigEE" to="unkn:~Single" resolve="Single" />
+          <node concept="3uibUv" id="2EeqUFatHMh" role="11_B2D">
+            <ref role="3uigEE" node="2daneBOWXQd" resolve="Effect" />
+            <node concept="3qUE_q" id="2EeqUFauyDu" role="11_B2D">
+              <node concept="3uibUv" id="2EeqUFauzPb" role="3qUE_r">
+                <ref role="3uigEE" node="1pPth$lAzAx" resolve="Step" />
+                <node concept="3qTvmN" id="2EeqUFau_VV" role="11_B2D" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3uibUv" id="2EeqUFatIFy" role="3clF45">
+        <ref role="3uigEE" to="unkn:~Single" resolve="Single" />
+        <node concept="3uibUv" id="2EeqUFatMFh" role="11_B2D">
+          <ref role="3uigEE" node="2daneBOWXQd" resolve="Effect" />
+          <node concept="3qUE_q" id="2EeqUFauwd9" role="11_B2D">
+            <node concept="3uibUv" id="2EeqUFauwEV" role="3qUE_r">
+              <ref role="3uigEE" node="1pPth$lAzAx" resolve="Step" />
+              <node concept="3qTvmN" id="2EeqUFauyjF" role="11_B2D" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3Tm1VV" id="2EeqUFats5C" role="1B3o_S" />
+      <node concept="3clFbS" id="2EeqUFats5D" role="3clF47">
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+          <node concept="2OqwBi" id="2EeqUFatNVe" role="3clFbG">
+            <node concept="37vLTw" id="2EeqUFatN$K" role="2Oq$k0">
+              <ref role="3cqZAo" node="2EeqUFatCnr" resolve="input" />
+            </node>
+            <node concept="liA8E" id="2EeqUFatWoH" role="2OqNvi">
+              <ref role="37wK5l" to="unkn:~Single.doOnError(io.reactivex.functions.Consumer)" resolve="doOnError" />
+              <node concept="1bVj0M" id="2EeqUFatZsJ" role="37wK5m">
+                <node concept="37vLTG" id="2EeqUFau0k0" role="1bW2Oz">
+                  <property role="TrG5h" value="t" />
+                  <node concept="3uibUv" id="2EeqUFau0N3" role="1tU5fm">
+                    <ref role="3uigEE" to="wyt6:~Throwable" resolve="Throwable" />
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+                </node>
+                <node concept="3clFbS" id="2EeqUFatZsL" role="1bW5cS">
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+                        <ref role="1Pybhc" to="31yc:4MaHsBDdlvx" resolve="MessageLog" />
+                      </node>
+                      <node concept="liA8E" id="2EeqUFau3HP" role="2OqNvi">
+                        <ref role="37wK5l" to="31yc:4MaHsBDgiaT" resolve="handle" />
+                        <node concept="2YIFZM" id="2EeqUFau3HQ" role="37wK5m">
+                          <ref role="37wK5l" to="et5u:~Message.createMessage(jetbrains.mps.messages.MessageKind,java.lang.String,java.lang.String,java.lang.Throwable)" resolve="createMessage" />
+                          <ref role="1Pybhc" to="et5u:~Message" resolve="Message" />
+                          <node concept="Rm8GO" id="2EeqUFau3HR" role="37wK5m">
+                            <ref role="Rm8GQ" to="et5u:~MessageKind.ERROR" resolve="ERROR" />
+                            <ref role="1Px2BO" to="et5u:~MessageKind" resolve="MessageKind" />
+                          </node>
+                          <node concept="2OqwBi" id="2EeqUFau3HS" role="37wK5m">
+                            <node concept="3VsKOn" id="2EeqUFau3HT" role="2Oq$k0">
+                              <ref role="3VsUkX" node="1pPth$l_TFV" resolve="CoderulesHelper" />
+                            </node>
+                            <node concept="liA8E" id="2EeqUFau3HU" role="2OqNvi">
+                              <ref role="37wK5l" to="wyt6:~Class.getSimpleName()" resolve="getSimpleName" />
+                            </node>
+                          </node>
+                          <node concept="Xl_RD" id="2EeqUFau3HV" role="37wK5m">
+                            <property role="Xl_RC" value="error" />
+                          </node>
+                          <node concept="37vLTw" id="2EeqUFau3HW" role="37wK5m">
+                            <ref role="3cqZAo" node="2EeqUFau0k0" resolve="t" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3clFbH" id="2EeqUFau3HX" role="3cqZAp" />
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+                            <node concept="1eOMI4" id="2EeqUFau65L" role="YScLw">
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+                                <node concept="3uibUv" id="2EeqUFau65N" role="10QFUM">
+                                  <ref role="3uigEE" to="wyt6:~Exception" resolve="Exception" />
+                                </node>
+                                <node concept="37vLTw" id="2EeqUFau65O" role="10QFUP">
+                                  <ref role="3cqZAo" node="4BHjwwGKJA$" resolve="failure" />
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                          <node concept="3clFbH" id="2EeqUFau65P" role="3cqZAp" />
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+                        <node concept="2ZW3vV" id="2EeqUFau65Q" role="3clFbw">
+                          <node concept="3uibUv" id="2EeqUFau65R" role="2ZW6by">
+                            <ref role="3uigEE" to="wyt6:~Exception" resolve="Exception" />
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+                          <node concept="37vLTw" id="2EeqUFau65S" role="2ZW6bz">
+                            <ref role="3cqZAo" node="4BHjwwGKJA$" resolve="failure" />
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+                              <node concept="2ShNRf" id="2EeqUFau65W" role="YScLw">
+                                <node concept="1pGfFk" id="2EeqUFau65X" role="2ShVmc">
+                                  <ref role="37wK5l" to="wyt6:~RuntimeException.&lt;init&gt;(java.lang.String,java.lang.Throwable)" resolve="RuntimeException" />
+                                  <node concept="Xl_RD" id="2EeqUFau65Y" role="37wK5m">
+                                    <property role="Xl_RC" value="unexpected failure" />
+                                  </node>
+                                  <node concept="37vLTw" id="2EeqUFau65Z" role="37wK5m">
+                                    <ref role="3cqZAo" node="4BHjwwGKJA$" resolve="failure" />
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
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