Delombok prints the ReceiverParameter (this), fixes #2444.

src/delombok/lombok/delombok/PrettyPrinter.java

@@ -796,8 +796,15 @@ public class PrettyPrinter extends JCTree.Visitor {
 			print(tree.name);
 		}
 		
-		print("(");
 		boolean first = true;
+		print("(");
+		
+		JCVariableDecl recvparam = readObject(tree, "recvparam", null);
+		if (recvparam != null) {
+			printVarDefInline(recvparam);
+			first = false;
+		}
+		
 		for (JCVariableDecl param : tree.params) {
 			if (!first) print(", ");
 			first = false;

test/pretty/resource/after/ThisParameter.java

@@ -0,0 +1,34 @@
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+class ThisParameter {
+	void untagged(ThisParameter this, int i) {
+		// no content
+	}
+	void sourceTagged(@SourceTagged("source") ThisParameter this) {
+		// no content
+	}
+	void classTagged(@ClassTagged("class") ThisParameter this) {
+		// no content
+	}
+	void runtimeTagged(@RuntimeTagged("runtime") ThisParameter this) {
+		// no content
+	}
+	@Target(ElementType.PARAMETER)
+	@Retention(RetentionPolicy.SOURCE)
+	@interface SourceTagged {
+		String value();
+	}
+	@Target(ElementType.PARAMETER)
+	@Retention(RetentionPolicy.CLASS)
+	@interface ClassTagged {
+		String value();
+	}
+	@Target(ElementType.PARAMETER)
+	@Retention(RetentionPolicy.RUNTIME)
+	@interface RuntimeTagged {
+		String value();
+	}
+}

test/pretty/resource/before/ThisParameter.java

@@ -0,0 +1,41 @@
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+class ThisParameter {
+	
+	void untagged(ThisParameter this, int i) {
+		// no content
+	}
+	
+	void sourceTagged(@SourceTagged("source") ThisParameter this) {
+		// no content
+	}
+	
+	void classTagged(@ClassTagged("class") ThisParameter this) {
+		// no content
+	}	
+	
+	void runtimeTagged(@RuntimeTagged("runtime") ThisParameter this) {
+		// no content
+	}
+	
+	@Target(ElementType.PARAMETER)
+	@Retention(RetentionPolicy.SOURCE)
+	@interface SourceTagged {
+		String value();
+	}
+	
+	@Target(ElementType.PARAMETER)
+	@Retention(RetentionPolicy.CLASS)
+	@interface ClassTagged {
+		String value();
+	}
+	
+	@Target(ElementType.PARAMETER)
+	@Retention(RetentionPolicy.RUNTIME)
+	@interface RuntimeTagged {
+		String value();
+	}
+}