Local interfaces are forbidden now

compiler/testData/diagnostics/tests/localInterfaces.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+fun foo() {
+    <!LOCAL_INTERFACE_NOT_ALLOWED!>interface a<!> {}
+    val b = object {
+        <!NESTED_CLASS_NOT_ALLOWED!>interface c<!> {}
+    }
+    class A {
+        <!NESTED_CLASS_NOT_ALLOWED!>interface d<!> {}
+    }
+    val f = {
+        <!LOCAL_INTERFACE_NOT_ALLOWED!>interface e<!> {}
+    }
+}

compiler/testData/diagnostics/tests/localInterfaces.txt

@@ -0,0 +1,3 @@
+package
+
+public fun foo(): kotlin.Unit

compiler/testData/diagnostics/tests/thisAndSuper/unqualifiedSuper/unqualifiedSuperWithLocalClass.kt

@@ -8,7 +8,7 @@ fun withLocalClasses(param: Int): Interface {
             get() = 100
     }
 
-    interface LocalInterface : Interface {
+    <!LOCAL_INTERFACE_NOT_ALLOWED!>interface LocalInterface<!> : Interface {
         override fun foo(x: Int): Int =
                 x + param
     }

compiler/testData/diagnostics/testsWithJsStdLib/unsupportedFeatures/localClassifier.kt

@@ -7,6 +7,6 @@ fun foo() {
         }
     }
 
-    <!NON_TOPLEVEL_CLASS_DECLARATION!>interface T<!> {
+    <!LOCAL_INTERFACE_NOT_ALLOWED, NON_TOPLEVEL_CLASS_DECLARATION!>interface T<!> {
     }
 }