IntelliJ demanded attention.

src/main/java/com/sk89q/worldedit/expression/runtime/For.java

@@ -57,6 +57,7 @@ public class For extends Node {
                 ret = body.getValue();
             } catch (BreakException e) {
                 if (e.doContinue) {
+                    //noinspection UnnecessaryContinue
                     continue;
                 } else {
                     break;

src/main/java/com/sk89q/worldedit/expression/runtime/SimpleFor.java

@@ -61,6 +61,7 @@ public class SimpleFor extends Node {
                 ret = body.getValue();
             } catch (BreakException e) {
                 if (e.doContinue) {
+                    //noinspection UnnecessaryContinue
                     continue;
                 } else {
                     break;

src/main/java/com/sk89q/worldedit/expression/runtime/Switch.java

@@ -157,9 +157,7 @@ public class Switch extends Node implements RValue {
                 final RValue invokable = defaultCase.optimize();
 
                 if (invokable instanceof Sequence) {
-                    for (RValue subInvokable : ((Sequence) invokable).sequence) {
+                    Collections.addAll(newSequence, ((Sequence) invokable).sequence);
-                        newSequence.add(subInvokable);
-                    }
                 } else {
                     newSequence.add(invokable);
                 }

src/main/java/com/sk89q/worldedit/expression/runtime/While.java

@@ -73,6 +73,7 @@ public class While extends Node {
                     ret = body.getValue();
                 } catch (BreakException e) {
                     if (e.doContinue) {
+                        //noinspection UnnecessaryContinue
                         continue;
                     } else {
                         break;