resolve parameters, infer function return type from body expression

idea/tests/org/jetbrains/jet/codegen/ExpressionGenTest.java

@@ -60,7 +60,7 @@ public class ExpressionGenTest extends LightDaemonAnalyzerTestCase {
         JetProperty p = PsiTreeUtil.getParentOfType(getFile().findElementAt(0), JetProperty.class);
 
         TraceMethodVisitor trace = new TraceMethodVisitor();
-        p.getInitializer().accept(new ExpressionCodegen(trace));
+        p.getInitializer().accept(new ExpressionCodegen(trace, null));
 
         StringWriter out = new StringWriter();
         trace.print(new PrintWriter(out));

idea/tests/org/jetbrains/jet/codegen/NamespaceGenTest.java

@@ -45,6 +45,17 @@ public class NamespaceGenTest extends LightCodeInsightFixtureTestCase {
         assertEquals(new Integer(42), returnValue);
     }
 
+    public void testReturnA() throws Exception {
+        myFixture.configureByFile(JetParsingTest.getTestDataDir() + "/codegen/returnA.jet");
+        final String text = generateToText();
+        System.out.println(text);
+
+        final Class aClass = generateToClass();
+        final Method main = firstMethod(aClass);
+        final Object returnValue = main.invoke(null, 42);
+        assertEquals(new Integer(42), returnValue);
+    }
+
     private String generateToText() {
         StringWriter writer = new StringWriter();
         JetFile jetFile = (JetFile) myFixture.getFile();