Fix compiler exception during resolution of ambiguous callable references

Function return type can't and should not be used during overload resolution of callable references.
Since it can be DeferredType, its substitution in CS caused exception.

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/results/FlatSignature.kt

@@ -16,8 +16,8 @@
 
 package org.jetbrains.kotlin.resolve.calls.results
 
+import org.jetbrains.kotlin.builtins.getAllParameterProjectionsFromCallableReflectionType
 import org.jetbrains.kotlin.container.DefaultImplementation
-import org.jetbrains.kotlin.container.PlatformExtensionsClashResolver
 import org.jetbrains.kotlin.container.PlatformSpecificExtension
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.descriptors.MemberDescriptor
@@ -62,7 +62,7 @@ class FlatSignature<out T> constructor(
             return FlatSignature(
                 origin,
                 descriptor.typeParameters,
-                reflectionType.arguments.map { it.type }, // should we drop return type?
+                reflectionType.getAllParameterProjectionsFromCallableReflectionType().map { it.type },
                 hasExtensionReceiver = false,
                 hasVarargs = descriptor.valueParameters.any { it.varargElementType != null },
                 numDefaults = numDefaults,

compiler/testData/diagnostics/tests/inference/regressions/kt32862_both.kt

@@ -0,0 +1,16 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// !WITH_NEW_INFERENCE
+
+interface G<T> {
+    fun build(): G<T>
+}
+class V1<V>(val value: V)
+class V2<V>(val value: V)
+fun <V, T : V?> G<T>.foo(vararg values: V1<V>) = build()
+fun <V, T : V?> G<T>.foo(vararg values: V2<V?>) = build()
+
+fun forReference(ref: Any?) {}
+
+fun test() {
+    forReference(G<Int?>::<!NI;CALLABLE_REFERENCE_RESOLUTION_AMBIGUITY, NI;DEBUG_INFO_MISSING_UNRESOLVED, OI;CANNOT_COMPLETE_RESOLVE!>foo<!>)
+}

compiler/testData/diagnostics/tests/inference/regressions/kt32862_both.txt

@@ -0,0 +1,29 @@
+package
+
+public fun forReference(/*0*/ ref: kotlin.Any?): kotlin.Unit
+public fun test(): kotlin.Unit
+public fun </*0*/ V, /*1*/ T : V?> G<T>.foo(/*0*/ vararg values: V1<V> /*kotlin.Array<out V1<V>>*/): G<T>
+public fun </*0*/ V, /*1*/ T : V?> G<T>.foo(/*0*/ vararg values: V2<V?> /*kotlin.Array<out V2<V?>>*/): G<T>
+
+public interface G</*0*/ T> {
+    public abstract fun build(): G<T>
+    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 V1</*0*/ V> {
+    public constructor V1</*0*/ V>(/*0*/ value: V)
+    public final val value: V
+    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 V2</*0*/ V> {
+    public constructor V2</*0*/ V>(/*0*/ value: V)
+    public final val value: V
+    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/inference/regressions/kt32862_none.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// !LANGUAGE: +NewInference
+// !WITH_NEW_INFERENCE
+
+fun foo(s: String) {}
+fun foo(i: Long) {}
+
+fun bar(f: (Boolean) -> Unit) {}
+
+fun test() {
+    bar(::<!NI;CALLABLE_REFERENCE_RESOLUTION_AMBIGUITY, NI;DEBUG_INFO_MISSING_UNRESOLVED, OI;NONE_APPLICABLE!>foo<!>)
+}

compiler/testData/diagnostics/tests/inference/regressions/kt32862_none.txt

@@ -0,0 +1,6 @@
+package
+
+public fun bar(/*0*/ f: (kotlin.Boolean) -> kotlin.Unit): kotlin.Unit
+public fun foo(/*0*/ i: kotlin.Long): kotlin.Unit
+public fun foo(/*0*/ s: kotlin.String): kotlin.Unit
+public fun test(): kotlin.Unit

core/descriptors/src/org/jetbrains/kotlin/builtins/ReflectionTypes.kt

@@ -112,7 +112,7 @@ class ReflectionTypes(module: ModuleDescriptor, private val notFoundClasses: Not
         fun isNumberedKPropertyOrKMutablePropertyType(type: KotlinType): Boolean =
                 isNumberedKPropertyType(type) || isNumberedKMutablePropertyType(type)
 
-        private fun isKCallableType(type: KotlinType): Boolean =
+        fun isKCallableType(type: KotlinType): Boolean =
             hasKCallableTypeFqName(type) || type.constructor.supertypes.any { isKCallableType(it) }
 
         fun hasKCallableTypeFqName(type: KotlinType): Boolean =

core/descriptors/src/org/jetbrains/kotlin/builtins/functionTypes.kt

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.types.typeUtil.asTypeProjection
 import org.jetbrains.kotlin.types.typeUtil.replaceAnnotations
 import org.jetbrains.kotlin.utils.DFS
 import org.jetbrains.kotlin.utils.addIfNotNull
+import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 import java.util.*
 
 private fun KotlinType.isTypeOrSubtypeOf(predicate: (KotlinType) -> Boolean): Boolean =
@@ -58,6 +59,9 @@ val KotlinType.isFunctionType: Boolean
 val KotlinType.isSuspendFunctionType: Boolean
     get() = constructor.declarationDescriptor?.getFunctionalClassKind() == FunctionClassDescriptor.Kind.SuspendFunction
 
+val KotlinType.isCallableReflectionType: Boolean
+    get() = ReflectionTypes.isKCallableType(this)
+
 val KotlinType.isKSuspendFunctionType: Boolean
     get() = constructor.declarationDescriptor?.getFunctionalClassKind() == FunctionClassDescriptor.Kind.KSuspendFunction
 
@@ -139,6 +143,14 @@ fun KotlinType.getValueParameterTypesFromFunctionType(): List<TypeProjection> {
     return arguments.subList(first, last)
 }
 
+fun KotlinType.getAllParameterProjectionsFromCallableReflectionType(): List<TypeProjection> {
+    assert(isCallableReflectionType) { "Not a callable reflection type: $this" }
+    val arguments = arguments
+    val last = arguments.size - 1
+    assert(last >= 0) { "Unexpected number of type arguments in type: $this" }
+    return arguments.subList(0, last)
+}
+
 fun KotlinType.extractParameterNameFromFunctionTypeArgument(): Name? {
     val annotation = annotations.findAnnotation(KotlinBuiltIns.FQ_NAMES.parameterName) ?: return null
     val name = (annotation.allValueArguments.values.singleOrNull() as? StringValue)