Bugfix variablehooks

lang/src/main/antlr4/edu/kit/iti/formal/psdbg/parser/ScriptLanguage.g4

@@ -212,4 +212,4 @@ QUESTION_MARK: '?';
 
 DIGITS : DIGIT+ ;
 fragment DIGIT : [0-9] ;
-ID : ([a-zA-Z]|'#') ([_a-zA-Z0-9] | '.' | '\\'| '#')*;
\ No newline at end of file
+ID : ([a-zA-Z]|'#'|'_') ([_a-zA-Z0-9] | '.' | '\\'| '#')*;
\ No newline at end of file

rt/src/main/java/edu/kit/iti/formal/psdbg/interpreter/assignhook/DefaultAssignmentHook.java

@@ -39,7 +39,8 @@ public abstract class DefaultAssignmentHook<T> implements VariableAssignmentHook
             Variable<T, S> variable = (Variable<T, S>) variables.get(variableName);
             return variable.setter.apply(data, value);
         }
-        return true;
+        //@AW: TODO was true: Why?
+        return false;
     }