Potential fix for KT-16673

See also:
http://stackoverflow.com/questions/42571812/unsupportedoperationexception-while-building-a-kotlin-project-in-idea

'original' for SamAdapterFunctionScope.MyFunctionDescriptor#doSubstitute should exactly match 'this.original',
so we can just provide it by default in SamAdapterFunctionScope.MyFunctionDescriptor#newCopyBuilder.

compiler/frontend.java/src/org/jetbrains/kotlin/synthetic/SamAdapterFunctionsScope.kt

@@ -167,10 +167,13 @@ class SamAdapterFunctionsScope(
             }
         }
 
+        override fun newCopyBuilder(substitutor: TypeSubstitutor): CopyConfiguration =
+                super.newCopyBuilder(substitutor).setOriginal(this.original)
+
         override fun doSubstitute(configuration: CopyConfiguration): FunctionDescriptor? {
             val descriptor = super.doSubstitute(configuration) as MyFunctionDescriptor? ?: return null
             val original = configuration.original
-                           ?: throw UnsupportedOperationException("doSubstitute with no original should not be called for synthetic extension")
+                           ?: throw UnsupportedOperationException("doSubstitute with no original should not be called for synthetic extension $this")
 
             original as MyFunctionDescriptor
             assert(original.original == original) { "original in doSubstitute should have no other original" }

compiler/testData/diagnostics/tests/platformTypes/rawSamOverrides.kt

@@ -0,0 +1,41 @@
+// (failed) attempt to reproduce exception in
+// http://stackoverflow.com/questions/42571812/unsupportedoperationexception-while-building-a-kotlin-project-in-idea
+
+// FILE: Fun.java
+public interface Fun<T> {
+    public void invoke(T x);
+}
+
+// FILE: A.java
+public interface A<T> {
+    public void foo(T x, Fun<? extends T> y);
+}
+
+// FILE: B.java
+public interface B extends A {
+    @Override
+    public void foo(Object x, Fun y);
+}
+
+// FILE: C.java
+public abstract class C {
+    public abstract <T> void bar(Fun<T> y);
+
+    public static <T> void aStaticMethod(T x, Fun<T> y) {}
+
+    public static abstract class D extends C {
+        @Override
+        public <T> void bar(Fun<T> y) {}
+
+        public static void aStaticMethod(Object x, Fun y) {}
+    }
+}
+
+// FILE: main.kt
+class E1 : C.D(), B {
+    override fun foo(x: Any, y: Fun<Any?>) {}
+}
+
+<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>class E2<!> : B {
+    <!NOTHING_TO_OVERRIDE!>override<!> fun foo(x: Any, y: Fun<String?>) {}
+}

compiler/testData/diagnostics/tests/platformTypes/rawSamOverrides.txt

@@ -0,0 +1,69 @@
+package
+
+public /*synthesized*/ fun </*0*/ T : kotlin.Any!> A(/*0*/ function: (x: T!, y: Fun<out T!>!) -> kotlin.Unit): A<T>
+public /*synthesized*/ fun B(/*0*/ function: (x: kotlin.Any!, y: Fun<(raw) kotlin.Any!>!) -> kotlin.Unit): B
+public /*synthesized*/ fun </*0*/ T : kotlin.Any!> Fun(/*0*/ function: (x: T!) -> kotlin.Unit): Fun<T>
+
+public interface A</*0*/ T : kotlin.Any!> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(/*0*/ x: T!, /*1*/ y: Fun<out T!>!): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface B : A<(raw) kotlin.Any!> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    @java.lang.Override public abstract override /*1*/ fun foo(/*0*/ x: kotlin.Any!, /*1*/ y: Fun<(raw) kotlin.Any!>!): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public abstract class C {
+    public constructor C()
+    public abstract fun </*0*/ T : kotlin.Any!> bar(/*0*/ y: Fun<T!>!): 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 abstract class D : C {
+        public constructor D()
+        @java.lang.Override public open override /*1*/ fun </*0*/ T : kotlin.Any!> bar(/*0*/ y: Fun<T!>!): 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
+
+        // Static members
+        public final override /*1*/ /*fake_override*/ fun </*0*/ T : kotlin.Any!> aStaticMethod(/*0*/ x: T!, /*1*/ y: ((x: T!) -> kotlin.Unit)!): kotlin.Unit
+        public final /*synthesized*/ fun aStaticMethod(/*0*/ x: kotlin.Any!, /*1*/ y: ((x: kotlin.Any!) -> kotlin.Unit)!): kotlin.Unit
+        public open fun aStaticMethod(/*0*/ x: kotlin.Any!, /*1*/ y: Fun<(raw) kotlin.Any!>!): kotlin.Unit
+    }
+
+    // Static members
+    public final /*synthesized*/ fun </*0*/ T : kotlin.Any!> aStaticMethod(/*0*/ x: T!, /*1*/ y: ((x: T!) -> kotlin.Unit)!): kotlin.Unit
+    public open fun </*0*/ T : kotlin.Any!> aStaticMethod(/*0*/ x: T!, /*1*/ y: Fun<T!>!): kotlin.Unit
+}
+
+public final class E1 : C.D, B {
+    public constructor E1()
+    @java.lang.Override public open override /*1*/ /*fake_override*/ fun </*0*/ T : kotlin.Any!> bar(/*0*/ y: Fun<T!>!): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun foo(/*0*/ x: kotlin.Any, /*1*/ y: Fun<kotlin.Any?>): kotlin.Unit
+    public open override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class E2 : B {
+    public constructor E2()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun foo(/*0*/ x: kotlin.Any, /*1*/ y: Fun<kotlin.String?>): kotlin.Unit
+    @java.lang.Override public abstract override /*1*/ /*fake_override*/ fun foo(/*0*/ x: kotlin.Any!, /*1*/ y: Fun<(raw) kotlin.Any!>!): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface Fun</*0*/ T : kotlin.Any!> {
+    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 abstract operator fun invoke(/*0*/ x: T!): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

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

@@ -14725,6 +14725,12 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("rawSamOverrides.kt")
+            public void testRawSamOverrides() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/platformTypes/rawSamOverrides.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("safeCall.kt")
             public void testSafeCall() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/platformTypes/safeCall.kt");