Merge remote-tracking branch 'origin/StartValueExtension' into StartValueExtension

# Conflicts:
#	src/test/resources/testing/InitialGuessFromParameter.ema
#	src/test/resources/testing/InitialGuessTest.ema

src/main/java/de/monticore/lang/embeddedmontiarc/cocos/InitialGuessIsAssignment.java

+/* (c) https://github.com/MontiCore/monticore */
+package de.monticore.lang.embeddedmontiarc.cocos;
+
+import de.monticore.lang.embeddedmontiarc.embeddedmontiarc._ast.ASTPortInitial;
+import de.monticore.lang.embeddedmontiarc.embeddedmontiarc._ast.ASTSubComponent;
+import de.monticore.lang.embeddedmontiarc.embeddedmontiarc._cocos.EmbeddedMontiArcASTSubComponentCoCo;
+import de.monticore.mcexpressions._ast.ASTAssignmentExpression;
+import de.se_rwth.commons.logging.Log;
+
+public class InitialGuessIsAssignment implements EmbeddedMontiArcASTSubComponentCoCo {
+    @Override
+    public void check(ASTSubComponent node) {
+        for (ASTPortInitial initialGuess : node.getPortInitialList()) {
+            if (initialGuess.getExpression() instanceof ASTAssignmentExpression) {
+                Log.error(String.format("0x079B7 Initial guess of has to be an assignment"),
+                node.get_SourcePositionStart());
+            }
+        }
+
+    }
+}

src/main/java/de/monticore/lang/embeddedmontiarc/embeddedmontiarc/_symboltable/instanceStructure/EMAComponentInstanceSymbol.java

@@ -310,10 +310,12 @@ public class EMAComponentInstanceSymbol
     }
 
     public Optional<EMAComponentInstanceSymbol> getEnclosingComponent() {
+        if (getEnclosingScope() == null) return Optional.empty();
         return (Optional<EMAComponentInstanceSymbol>) getEnclosingScope().getSpanningSymbol();
     }
 
     public Optional<EMAComponentInstanceSymbol> getParent() {
+        if (getEnclosingScope() == null) return Optional.empty();
         return (Optional<EMAComponentInstanceSymbol>) getEnclosingScope().getSpanningSymbol();
     }