Report error on non-top-level type aliases (unsupported in 1.1).

Get rid of nested type aliases in project.

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java

@@ -130,6 +130,7 @@ public interface Errors {
     DiagnosticFactory0<KtParameter> REIFIED_TYPE_IN_CATCH_CLAUSE = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory0<KtTypeParameterList> GENERIC_THROWABLE_SUBCLASS = DiagnosticFactory0.create(ERROR);
 
+    DiagnosticFactory0<KtTypeAlias> TOPLEVEL_TYPEALIASES_ONLY = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory1<KtElement, ClassifierDescriptor> RECURSIVE_TYPEALIAS_EXPANSION = DiagnosticFactory1.create(ERROR);
     DiagnosticFactory3<KtElement, KotlinType, KotlinType, ClassifierDescriptor> UPPER_BOUND_VIOLATED_IN_TYPEALIAS_EXPANSION =
             DiagnosticFactory3.create(ERROR);

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java

@@ -434,6 +434,7 @@ public class DefaultErrorMessages {
         MAP.put(USELESS_ELVIS_RIGHT_IS_NULL, "Right operand of elvis operator (?:) is useless if it is null");
         MAP.put(CONFLICTING_UPPER_BOUNDS, "Upper bounds of {0} have empty intersection", NAME);
 
+        MAP.put(TOPLEVEL_TYPEALIASES_ONLY, "Nested and local type aliases are not supported");
         MAP.put(RECURSIVE_TYPEALIAS_EXPANSION, "Recursive type alias in expansion: {0}", NAME);
         MAP.put(UPPER_BOUND_VIOLATED_IN_TYPEALIAS_EXPANSION,
                 "Type argument resulting from type alias expansion is not within required bounds for ''{2}'': " +

compiler/frontend/src/org/jetbrains/kotlin/resolve/DescriptorResolver.java

@@ -661,6 +661,10 @@ public class DescriptorResolver {
             @NotNull KtTypeAlias typeAlias,
             @NotNull final BindingTrace trace
     ) {
+        if (!(containingDeclaration instanceof PackageFragmentDescriptor)) {
+            trace.report(TOPLEVEL_TYPEALIASES_ONLY.on(typeAlias));
+        }
+
         KtModifierList modifierList = typeAlias.getModifierList();
         Visibility visibility = resolveVisibilityFromModifiers(typeAlias, getDefaultVisibility(typeAlias, containingDeclaration));