fixed Issue 233:

Javac parser handles ";" (empty statements) as empty blocks with an invalid position. Thats why delomok replaces ";" with "{}". This gets an issue when you use this in an interface, since interfaces are not allowed to have initializer blocks.

src/delombok/lombok/delombok/PrettyCommentsPrinter.java

@@ -103,6 +103,7 @@ import com.sun.tools.javac.tree.JCTree.TypeBoundKind;
 import com.sun.tools.javac.util.Convert;
 import com.sun.tools.javac.util.List;
 import com.sun.tools.javac.util.Name;
+import com.sun.tools.javac.util.Position;
 
 /** Prints out a tree as an indented Java source program.
  *
@@ -480,14 +481,18 @@ public class PrettyCommentsPrinter extends JCTree.Visitor {
     /** Print a block.
      */
     public void printBlock(List<? extends JCTree> stats, JCTree container) throws IOException {
-        print("{");
-        println();
-        indent();
-        printStats(stats);
-        consumeComments(endPos(container));
-        undent();
-        align();
-        print("}");
+        if ((Position.NOPOS == container.pos) && stats.isEmpty()) {
+            print(";");
+        } else {
+            print("{");
+            println();
+            indent();
+            printStats(stats);
+            consumeComments(endPos(container));
+            undent();
+            align();
+            print("}");
+        }
     }
 
     /** Print a block.

test/pretty/resource/after/Enum.java

@@ -3,6 +3,7 @@ enum Ranks {
 	HEARTS,
 	DIAMONDS,
 	SPADES;
+	;
 }
 enum Complex {
 	RED("ff0000"),

test/pretty/resource/after/Interfaces.java

@@ -1,5 +1,13 @@
 @SuppressWarnings("all")
 interface Interfaces {
+	enum Ranks {
+		CLUBS,
+		HEARTS,
+		DIAMONDS,
+		SPADES;
+	}
+	;
+	;
 	int x = 10;
 	void y();
 	int a = 20;

test/pretty/resource/before/Enum.java

@@ -1,5 +1,5 @@
 enum Ranks {
-	CLUBS, HEARTS, DIAMONDS, SPADES
+	CLUBS, HEARTS, DIAMONDS, SPADES;;
 }
 
 enum Complex {

test/pretty/resource/before/Interfaces.java

@@ -1,5 +1,13 @@
 @SuppressWarnings("all")
 interface Interfaces {
+	enum Ranks {
+		CLUBS,
+		HEARTS,
+		DIAMONDS,
+		SPADES;
+	}
+	;
+	;
 	int x = 10;
 	void y();
 	public static final int a = 20;