Allow singletons and functions with the same name

compiler/frontend/src/org/jetbrains/jet/lang/resolve/OverloadResolver.java

@@ -91,6 +91,10 @@ public class OverloadResolver {
         MultiMap<Key, ConstructorDescriptor> inNamespaces = MultiMap.create();
 
         for (MutableClassDescriptor klass : context.getClasses().values()) {
+            if (klass.getKind().isSingleton()) {
+                // Constructors of singletons aren't callable from the code, so they shouldn't participate in overload name checking
+                continue;
+            }
             DeclarationDescriptor containingDeclaration = klass.getContainingDeclaration();
             if (containingDeclaration instanceof NamespaceDescriptor) {
                 NamespaceDescriptor namespaceDescriptor = (NamespaceDescriptor) containingDeclaration;

compiler/testData/diagnostics/tests/redeclarations/SingletonAndFunctionSameName.kt

@@ -0,0 +1,21 @@
+fun Foo() = 42
+
+object Foo {
+    fun Bar() = 239
+
+    object Bar
+}
+
+
+
+<!CONFLICTING_OVERLOADS!>fun En()<!> = 239
+
+enum class <!CONFLICTING_OVERLOADS!>En<!> {
+    ENTRY
+
+    SUBCLASS { }
+
+    fun ENTRY() = 42
+
+    fun SUBCLASS() = ENTRY()
+}

compiler/tests/org/jetbrains/jet/checkers/JetDiagnosticsTestGenerated.java

@@ -5033,6 +5033,11 @@ public class JetDiagnosticsTestGenerated extends AbstractDiagnosticsTestWithEage
                 doTest("compiler/testData/diagnostics/tests/redeclarations/RedeclaredTypeParameters.kt");
             }
             
+            @TestMetadata("SingletonAndFunctionSameName.kt")
+            public void testSingletonAndFunctionSameName() throws Exception {
+                doTest("compiler/testData/diagnostics/tests/redeclarations/SingletonAndFunctionSameName.kt");
+            }
+            
         }
         
         @TestMetadata("compiler/testData/diagnostics/tests/regressions")