diff --git a/Var.mpl b/Var.mpl
index 4705672..be9eb2b 100644
--- a/Var.mpl
+++ b/Var.mpl
@@ -333,7 +333,7 @@ getVirtualValue: [
           ]
           VarImport  [VarImport  pointeeVar.data.get @result.cat]
           [
-            [FALSE] "Wrong type for virtual reference!" assert
+            "Wrong type for virtual reference!" failProc
           ]
         ) case
       ] if
@@ -342,7 +342,7 @@ getVirtualValue: [
       refToVar isPlain [
         refToVar getPlainConstantIR @result.cat
       ] [
-        [FALSE] "Wrong type for virtual value!" assert
+        "Wrong type for virtual value!" failProc
       ] if
     ]
   ) case
@@ -414,7 +414,7 @@ getPlainConstantIR: [
                         var.data.getTag VarReal32 = [VarReal32 var.data.get.end Real32 cast Real64 cast bitView @result set] [
                           var.data.getTag VarReal64 = [VarReal64 var.data.get.end bitView @result set] [
                             ("Tag = " makeStringView var.data.getTag Int32 cast) addLog
-                            [FALSE] "Unknown plain struct while getting IR value" assert
+                            "Unknown plain struct while getting IR value" failProc
                           ] if
                         ] if
                       ] if
diff --git a/builtinImpl.mpl b/builtinImpl.mpl
index 7fe9925..97760d6 100644
--- a/builtinImpl.mpl
+++ b/builtinImpl.mpl
@@ -655,7 +655,7 @@ staticityOfBinResult: [
       varSchema: refToSchema getVar;
       schemaOfResult: RefToVar;
       varSchema.data.getTag VarRef = [
-        [FALSE] "Unable in current semantic!" assert
+        "Unable in current semantic!" failProc
       ] [
         refToSchema @schemaOfResult set
       ] if
diff --git a/codeNode.mpl b/codeNode.mpl
index ff1ce2f..774d338 100644
--- a/codeNode.mpl
+++ b/codeNode.mpl
@@ -76,7 +76,7 @@ addNameInfo: [
                   # do nothing
                   FALSE @addInfo set
                 ] [
-                  [FALSE] "wrong name info case" assert
+                  "wrong name info case" failProc
                 ] if
               ] if
             ] if
@@ -2445,7 +2445,7 @@ addLambdaEvent: [
           implNode.varNameInfo 0 < ~ [
             gnr: implNode.varNameInfo @processor @block getNameEverywhere;
             processor compilable ~ [
-              [FALSE] "Name of new lambda is not visible!" assert
+              "Name of new lambda is not visible!" failProc
             ] [
               cnr: @gnr 0 dynamic @processor @block processor.positions.last.file captureName;
               cnr.refToVar @result.@refToVar set
diff --git a/debugWriter.mpl b/debugWriter.mpl
index f427d89..3932d5e 100644
--- a/debugWriter.mpl
+++ b/debugWriter.mpl
@@ -103,7 +103,7 @@ getPlainTypeDebugDeclaration: [
                         var.data.getTag VarReal32 = [processor.debugInfo.unit 13 +] [
                           var.data.getTag VarReal64 = [processor.debugInfo.unit 14 +] [
                             var.data.getTag VarString = [processor.debugInfo.unit 15 +] [
-                              [FALSE] "Unknown plain struct while getting debug declaration index" assert
+                              "Unknown plain struct while getting debug declaration index" failProc
                               -1
                             ] if
                           ] if
@@ -169,7 +169,7 @@ getTypeDebugDeclaration: [
   compileOnce
   var: refToVar getVar;
   refToVar isVirtualType [
-    [FALSE] "virtual type has not debug declaration" assert
+    "virtual type has not debug declaration" failProc
     -1
   ] [
     refToVar isPlain [var.data.getTag VarString =] || [
@@ -223,7 +223,7 @@ getTypeDebugDeclaration: [
               ")") assembleString addDebugString
             index
           ] [
-            [FALSE] "Unknown type in getTypeDebugDeclaration!" assert
+            "Unknown type in getTypeDebugDeclaration!" failProc
             -1
           ] if
         ] if
diff --git a/irWriter.mpl b/irWriter.mpl
index d4a30fe..2759328 100644
--- a/irWriter.mpl
+++ b/irWriter.mpl
@@ -38,7 +38,7 @@ getStaticStructIR: [
       @unfinishedVars.popBack
 
       current isVirtual [
-        [FALSE] "Virtual field cannot be processed in static array constant!" assert
+        "Virtual field cannot be processed in static array constant!" failProc
       ] [
         current isPlain [
           (current @processor getIrType " " current getPlainConstantIR) @result.catMany
@@ -68,7 +68,7 @@ getStaticStructIR: [
               ] when
             ] times
           ] [
-            [FALSE] "Unknown type in static struct!" assert
+            "Unknown type in static struct!" failProc
           ] if
         ] if
       ] if
diff --git a/parser.mpl b/parser.mpl
index d547c2b..27fc76b 100644
--- a/parser.mpl
+++ b/parser.mpl
@@ -1206,8 +1206,8 @@ parseNode: [
     pc: makeParserConstants;
 
     unfinishedPositions: PositionInfo Array;
-    unfinishedLabelNames: String Array;
-    unfinishedNodes: AstNodeArray Array;
+    unfinishedLabelNames: String Array dynamic;
+    unfinishedNodes: AstNodeArray Array dynamic;
     unfinishedTerminators: Nat32 Array;
 
     fileId          @currentPosition.@fileId set
diff --git a/processSubNodes.mpl b/processSubNodes.mpl
index e6340c5..6d04d2d 100644
--- a/processSubNodes.mpl
+++ b/processSubNodes.mpl
@@ -705,7 +705,7 @@ fixOutputRefsRec: [
               currentFromStack @stackEntryVar.@sourceOfValue set
             ] if
           ] [
-            [FALSE] "Source of value is unknown!" assert
+            "Source of value is unknown!" failProc
           ] if
 
           [currentFromStack hasGoodSource] "Stack var source invariant failed!" assert
@@ -1471,7 +1471,7 @@ useMatchingInfoOnly: [
     oldSuccess [
       processor.@result.passErrorThroughPRE ~ [-1 @processor.@result clearProcessorResult] when
     ] [
-      [FALSE] "Has compilerError before trying compiling pre!" assert
+      "Has compilerError before trying compiling pre!" failProc
     ] if
 
     newNode.uncompilable ~ [
diff --git a/schemas.mpl b/schemas.mpl
index 7df027f..698f74b 100644
--- a/schemas.mpl
+++ b/schemas.mpl
@@ -111,7 +111,7 @@ VariableSchema: [{
         ] times
 
         [
-          [FALSE] "invalid tag in VariableSchema" assert
+          "invalid tag in VariableSchema" failProc
           FALSE
         ]
       ) case
diff --git a/variable.mpl b/variable.mpl
index 7b7df1c..891c6bc 100644
--- a/variable.mpl
+++ b/variable.mpl
@@ -125,7 +125,7 @@ getPlainDataIRType: [
     VarReal64 ["double" toString @result set]
     [
       ("Tag = " var.data.getTag) addLog
-      [FALSE] "Unknown plain struct while getting IR type" assert
+      "Unknown plain struct while getting IR type" failProc
     ]
   ) case
 
@@ -152,7 +152,7 @@ getPlainDataMPLType: [
     VarReal64 ["r64" toString @result set]
     [
       ("Tag = " var.data.getTag) addLog
-      [FALSE] "Unknown plain struct MPL type" assert
+      "Unknown plain struct MPL type" failProc
     ]
   ) case
 
@@ -541,7 +541,7 @@ makeDbgTypeId: [
         "}" @resultDBG.cat
       ] when
     ]
-    [[FALSE] "Unknown variable for IR type" assert]
+    ["Unknown variable for IR type" failProc]
   ) cond
 
   @resultDBG @processor makeStringId
@@ -591,7 +591,7 @@ makeDbgTypeId: [
         ] if
       ] when
     ]
-    [[FALSE] "Unknown variable for IR type" assert]
+    ["Unknown variable for IR type" failProc]
   ) cond
 
   irTypeId: Int32;
@@ -650,7 +650,7 @@ makeDbgTypeId: [
         ] loop
         "}" @resultMPL.cat
       ] [
-        [FALSE] "Unknown variable for IR type" assert
+        "Unknown variable for IR type" failProc
       ] if
     ] if
   ] if
@@ -714,7 +714,7 @@ zeroValue: [
                         tag VarReal32 = [0.0r64] [
                           tag VarReal64 = [0.0r64] [
                             ("Tag = " makeStringView .getTag 0 cast) addLog
-                            [FALSE] "Unknown plain struct while getting Zero value" assert
+                            "Unknown plain struct while getting Zero value" failProc
                           ] if
                         ] if
                       ] if