fix missing unboxing on upper bounded generics extending a boxed type

Author: arnetheduck@gmail.com

plugin/src/se/arnetheduck/j2c/transform/ImplWriter.java

@@ -598,7 +598,6 @@ public boolean preVisit2(ASTNode node) {
 
 		if (node instanceof Expression) {
 			Expression expr = (Expression) node;
-			ITypeBinding tb = expr.resolveTypeBinding();
 
 			if ((expr.resolveBoxing() || expr.resolveUnboxing())
 					&& checkBoxNesting(expr)) {
@@ -610,6 +609,7 @@ && checkBoxNesting(expr)) {
 
 					visits.add(new NodeInfo(node, ")"));
 				} else if (expr.resolveUnboxing()) {
+					ITypeBinding tb = expr.resolveTypeBinding().getErasure();
 					if (TransformUtil.reverses.containsKey(tb
 							.getQualifiedName())) {
 						hardDep(tb);

test/src/se/arnetheduck/j2c/test/generics/GenericBoxing.java

@@ -0,0 +1,12 @@
+package se.arnetheduck.j2c.test.generics;
+
+public class GenericBoxing {
+	public interface T<X> {
+		X value();
+	}
+
+	long m(T<? extends Long> t) {
+		// Auto-unboxing should happen as X is guaranteed to extend Long
+		return t.value();
+	}
+}