[fixes #2049] Delombok now figures out usages of ‘var’ and delomboks them as just ‘var’ instead of their actual type.

doc/changelog.markdown

@@ -6,6 +6,7 @@ Lombok Changelog
 * FEATURE: When using `@NonNull`, or any other annotation that would result in a null-check, you can configure to generate an assert statement instead. [Issue #2078](https://github.com/rzwitserloot/lombok/issues/2078).
 * BUGFIX: var/val on methods that return an intersection type would now work in Eclipse. [Issue #1986](https://github.com/rzwitserloot/lombok/issues/1986)
 * BUGFIX: Fix for java6 regression if a field has javadoc. [Issue #2066](https://github.com/rzwitserloot/lombok/issues/2066)
+* BUGFIX: Delombok now delomboks java10's own `var` as `var` and not as the actual underlying type. [Issue #2049](https://github.com/rzwitserloot/lombok/issues/2049)
 * IMPROBABLE BREAKING CHANGE: For fields and parameters marked non-null, if the method body starts with an assert statement to ensure the value isn't null, no code to throw an exception will be generated.
 
 ### v1.18.6 (February 12th, 2019)

src/delombok/lombok/delombok/Delombok.java

@@ -753,6 +753,7 @@ public class Delombok {
 		Object care = callAttributeMethodOnJavaCompiler(delegate, delegate.todo);
 		
 		callFlowMethodOnJavaCompiler(delegate, care);
+		
 		FormatPreferences fps = new FormatPreferences(formatPrefs);
 		for (JCCompilationUnit unit : roots) {
 			DelombokResult result = new DelombokResult(catcher.getComments(unit), unit, force || options.isChanged(unit), fps);

src/delombok/lombok/delombok/PrettyPrinter.java

@@ -648,7 +648,11 @@ public class PrettyPrinter extends JCTree.Visitor {
 		 */
 		try {
 			innermostArrayBracketsAreVarargs = varargs;
-			print(tree.vartype);
+			if (tree.vartype == null || tree.vartype.pos == -1) {
+				print("var");
+			} else {
+				print(tree.vartype);
+			}
 		} finally {
 			innermostArrayBracketsAreVarargs = false;
 		}

test/pretty/resource/after/Java11Var.javva

@@ -0,0 +1,6 @@
+public class Java11Var {
+	public void test() {
+		var b = 10;
+		int c = 11;
+	}
+}

test/pretty/resource/before/Java11Var.java

@@ -0,0 +1,7 @@
+//version 11:
+public class Java11Var {
+	public void test() {
+		var b = 10;
+		int c = 11;
+	}
+}