FE KT-47939 callable references to functional interface constructors

Allow callable references to Kotlin 'fun interface' constructors.
Prohibit callable references to Java SAM interface constructors.

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/checkers/SamInterfaceConstructorReferenceCallChecker.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.resolve.jvm.checkers
+
+import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.config.LanguageFeature
+import org.jetbrains.kotlin.resolve.calls.checkers.CallChecker
+import org.jetbrains.kotlin.resolve.calls.checkers.CallCheckerContext
+import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
+import org.jetbrains.kotlin.resolve.calls.util.isCallableReference
+import org.jetbrains.kotlin.resolve.jvm.diagnostics.ErrorsJvm
+import org.jetbrains.kotlin.resolve.sam.SamConstructorDescriptor
+
+object SamInterfaceConstructorReferenceCallChecker : CallChecker {
+    override fun check(resolvedCall: ResolvedCall<*>, reportOn: PsiElement, context: CallCheckerContext) {
+        if (!context.languageVersionSettings.supportsFeature(LanguageFeature.ProhibitJavaSamInterfaceConstructorReference)) return
+
+        val resultingDescriptor = resolvedCall.resultingDescriptor
+        if (resultingDescriptor !is SamConstructorDescriptor || !resolvedCall.call.isCallableReference()) return
+
+        if (!resultingDescriptor.baseDescriptorForSynthetic.isFun) {
+            context.trace.report(
+                ErrorsJvm.JAVA_SAM_INTERFACE_CONSTRUCTOR_REFERENCE.on(reportOn)
+            )
+        }
+    }
+}

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/diagnostics/DefaultErrorMessagesJvm.java

@@ -223,6 +223,8 @@ public class DefaultErrorMessagesJvm implements DefaultErrorMessages.Extension {
 
         MAP.put(TYPEOF_SUSPEND_TYPE, "Suspend functional types are not supported in typeOf");
         MAP.put(TYPEOF_NON_REIFIED_TYPE_PARAMETER_WITH_RECURSIVE_BOUND, "Non-reified type parameters with recursive bounds are not supported yet: {0}", STRING);
+
+        MAP.put(JAVA_SAM_INTERFACE_CONSTRUCTOR_REFERENCE, "Java SAM interface constructor references are prohibited");
     }
 
     @NotNull

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/diagnostics/ErrorsJvm.java

@@ -202,6 +202,8 @@ public interface ErrorsJvm {
     DiagnosticFactory0<PsiElement> TYPEOF_SUSPEND_TYPE = DiagnosticFactory0.create(ERROR);
     DiagnosticFactory1<PsiElement, String> TYPEOF_NON_REIFIED_TYPE_PARAMETER_WITH_RECURSIVE_BOUND = DiagnosticFactory1.create(ERROR);
 
+    DiagnosticFactory0<PsiElement> JAVA_SAM_INTERFACE_CONSTRUCTOR_REFERENCE = DiagnosticFactory0.create(ERROR);
+
     @SuppressWarnings("UnusedDeclaration")
     Object _initializer = new Object() {
         {

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/platform/JvmPlatformConfigurator.kt

@@ -6,9 +6,10 @@
 package org.jetbrains.kotlin.resolve.jvm.platform
 
 import org.jetbrains.kotlin.builtins.jvm.JavaToKotlinClassMapper
-import org.jetbrains.kotlin.config.LanguageFeature
-import org.jetbrains.kotlin.config.LanguageVersionSettings
-import org.jetbrains.kotlin.container.*
+import org.jetbrains.kotlin.container.PlatformExtensionsClashResolver
+import org.jetbrains.kotlin.container.StorageComponentContainer
+import org.jetbrains.kotlin.container.useImpl
+import org.jetbrains.kotlin.container.useInstance
 import org.jetbrains.kotlin.load.java.sam.JvmSamConversionOracle
 import org.jetbrains.kotlin.resolve.PlatformConfiguratorBase
 import org.jetbrains.kotlin.resolve.checkers.BigFunctionTypeAvailabilityChecker
@@ -58,6 +59,7 @@ object JvmPlatformConfigurator : PlatformConfiguratorBase(
         ApiVersionIsAtLeastArgumentsChecker,
         InconsistentOperatorFromJavaCallChecker,
         PolymorphicSignatureCallChecker,
+        SamInterfaceConstructorReferenceCallChecker,
     ),
 
     additionalTypeCheckers = listOf(