Compatibility with java 6

(cherry picked from commit 9259771)

Author: zolotov

src/com/goide/inspections/GoDuplicateFunctionOrMethodInspection.java

@@ -52,7 +52,7 @@ public void visitMethodDeclaration(@NotNull final GoMethodDeclaration method) {
         String typeText = GoMethodDeclarationStubElementType.calcTypeText(method);
         if (typeText == null) return;
 
-        GoFile file = method.getContainingFile();
+        final GoFile file = method.getContainingFile();
         GlobalSearchScope scope = GoPackageUtil.packageScope(file);
         IdFilter idFilter = GoIdFilter.getFilesFilter(scope);
         final Module module = ModuleUtilCore.findModuleForPsiElement(file);

src/com/goide/inspections/GoFileIgnoredByBuildToolNotificationProvider.java

@@ -100,7 +100,7 @@ else if (module != null && !GoUtil.matchedForModuleBuildTarget(psiFile, module))
     return null;
   }
 
-  private static EditorNotificationPanel createIgnoredByBuildToolPanel(@NotNull Project project, @NotNull VirtualFile file) {
+  private static EditorNotificationPanel createIgnoredByBuildToolPanel(@NotNull final Project project, @NotNull VirtualFile file) {
     EditorNotificationPanel panel = new EditorNotificationPanel();
     String fileName = file.getName();
     panel.setText("'" + fileName + "' will be ignored by build tool since its name starts with '" + fileName.charAt(0) + "'");

src/com/goide/psi/impl/GoPsiImplUtil.java

@@ -148,8 +148,8 @@ public static GoReference getReference(@NotNull GoReferenceExpression o) {
 
   @NotNull
   public static PsiReference getReference(@NotNull GoFieldName o) {
-    GoFieldNameReference field = new GoFieldNameReference(o);
-    GoReference ordinal = new GoReference(o);
+    final GoFieldNameReference field = new GoFieldNameReference(o);
+    final GoReference ordinal = new GoReference(o);
     return new PsiMultiReference(new PsiReference[]{field, ordinal}, o) {
       @Override
       public PsiElement resolve() {

src/com/goide/util/GoExecutor.java

@@ -212,7 +212,7 @@ public boolean execute() {
     GeneralCommandLine commandLine = null;
     try {
       commandLine = createCommandLine();
-      GeneralCommandLine finalCommandLine = commandLine;
+      final GeneralCommandLine finalCommandLine = commandLine;
       myProcessHandler = new KillableColoredProcessHandler(finalCommandLine) {
         @Override
         public void startNotify() {