Update SideEffectAnalyzer.java

Author: Frotty

de.peeeq.wurstscript/src/main/java/de/peeeq/wurstscript/intermediatelang/optimizer/SideEffectAnalyzer.java

@@ -514,7 +514,8 @@ private boolean functionHasSideEffects(ImFunction func) {
 
         private boolean hasGlobalSideEffects(Element elem) {
             for (ImVar var : directlySetVariables(elem)) {
-                if (var.isGlobal()) {
+                // Some optimization passes temporarily detach vars; in that state isGlobal() throws.
+                if (isAttachedGlobal(var)) {
                     return true;
                 }
             }
@@ -530,5 +531,10 @@ private boolean hasGlobalSideEffects(Element elem) {
             }
             return false;
         }
+
+        private boolean isAttachedGlobal(ImVar var) {
+            Element parent = var.getParent();
+            return parent != null && parent.getParent() instanceof ImProg;
+        }
     }
 }