tracking module integrity when module composition changes

src/main/java/carpet/script/Expression.java

@@ -16,6 +16,7 @@ import carpet.script.exception.BreakStatement;
 import carpet.script.exception.ContinueStatement;
 import carpet.script.exception.ExitStatement;
 import carpet.script.exception.ExpressionException;
+import carpet.script.exception.IntegrityException;
 import carpet.script.exception.InternalExpressionException;
 import carpet.script.exception.ResolvedException;
 import carpet.script.exception.ReturnStatement;
@@ -267,6 +268,8 @@ public class Expression
     {
         if (exc instanceof ExitStatement)
             return exc;
+        if (exc instanceof IntegrityException)
+            return exc;
         if (exc instanceof InternalExpressionException)
             return ((InternalExpressionException) exc).promote(c, e, token);
         if (exc instanceof ArithmeticException)