KT-3856 Wrong inner class inaccessible diagnostic for extension to outer class

#KT-3856 Fixed

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/CandidateResolver.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2016 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -230,6 +230,13 @@ class CandidateResolver(
     }
 
     private fun checkOuterClassMemberIsAccessible(context: CallCandidateResolutionContext<*>): Boolean {
+
+        fun KtElement.insideScript() = (containingFile as? KtFile)?.isScript ?: false
+
+        // context.scope doesn't contains outer class implicit receiver if we inside nested class
+        // Outer scope for some class in script file is scopeForInitializerResolution see: DeclarationScopeProviderImpl.getResolutionScopeForDeclaration
+        if (!context.call.callElement.insideScript()) return true
+
         // In "this@Outer.foo()" the error will be reported on "this@Outer" instead
         if (context.call.getExplicitReceiver() != null || context.call.getDispatchReceiver() != null) return true
 

compiler/testData/diagnostics/tests/scopes/inheritance/kt3856.kt

@@ -0,0 +1,33 @@
+fun foo(<!UNUSED_PARAMETER!>init<!>: A.() -> Unit) { }
+
+class A {
+    var x: Int = 0
+    companion object {
+        val f = foo() {
+            x = 1
+        }
+    }
+}
+
+class B(val a: String) {
+    fun f() = 0
+    companion object   {
+        fun B.bar() = a + f()
+    }
+}
+
+open class C {
+    fun bar() {}
+}
+
+class E: C() {
+
+    class D {
+        init {
+            with(C()) {
+                bar()
+                this.bar()
+            }
+        }
+    }
+}

compiler/testData/diagnostics/tests/scopes/inheritance/kt3856.txt

@@ -0,0 +1,59 @@
+package
+
+public fun foo(/*0*/ init: A.() -> kotlin.Unit): kotlin.Unit
+
+public final class A {
+    public constructor A()
+    public final var x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    public companion object Companion {
+        private constructor Companion()
+        public final val f: kotlin.Unit
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}
+
+public final class B {
+    public constructor B(/*0*/ a: kotlin.String)
+    public final val a: kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final fun f(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    public companion object Companion {
+        private constructor Companion()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+        public final fun B.bar(): kotlin.String
+    }
+}
+
+public open class C {
+    public constructor C()
+    public final fun bar(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class E : C {
+    public constructor E()
+    public final override /*1*/ /*fake_override*/ fun bar(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+    public final class D {
+        public constructor D()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+    }
+}

compiler/testData/diagnostics/tests/scopes/inheritance/statics/companionObject/inheritFromContainingClass.kt

@@ -27,8 +27,8 @@ open class A<T> : J() {
         fun test() {
             foo()
             bar()
-            val a: Int = <!INACCESSIBLE_OUTER_CLASS_EXPRESSION!>baz()<!>
-            val b: <!UNRESOLVED_REFERENCE!>T<!> = <!INACCESSIBLE_OUTER_CLASS_EXPRESSION!>baz()<!>
+            val a: Int = baz()
+            val b: <!UNRESOLVED_REFERENCE!>T<!> = baz()
         }
     }
 

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -15101,6 +15101,12 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                     doTest(fileName);
                 }
 
+                @TestMetadata("kt3856.kt")
+                public void testKt3856() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/scopes/inheritance/kt3856.kt");
+                    doTest(fileName);
+                }
+
                 @TestMetadata("methodsPriority.kt")
                 public void testMethodsPriority() throws Exception {
                     String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/scopes/inheritance/methodsPriority.kt");