Support common calls on suspend function typed values

Also support multiple value parameters in suspend function type

 #KT-15379 Fixed
 #KT-15380 Fixed

compiler/backend-common/src/org/jetbrains/kotlin/backend/common/commonCoroutineCodegenUtil.kt

@@ -22,6 +22,7 @@ import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.descriptorUtil.builtIns
 
 val SUSPEND_WITH_CURRENT_CONTINUATION_NAME = Name.identifier("suspendWithCurrentContinuation")
+val CONTINUATION_RESUME_METHOD_NAME = Name.identifier("resume")
 
 fun FunctionDescriptor.getBuiltInSuspendWithCurrentContinuation() =
         builtIns.builtInsCoroutinePackageFragment.getMemberScope()

compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/CoroutineCodegen.kt

@@ -265,7 +265,7 @@ class CoroutineCodegen(
     }
 
     private fun allLambdaParameters() =
-            coroutineLambdaDescriptor.extensionReceiverParameter.singletonOrEmptyList()
+            coroutineLambdaDescriptor.extensionReceiverParameter.singletonOrEmptyList() + coroutineLambdaDescriptor.valueParameters
 
     private fun ExpressionCodegen.generateLoadField(fieldInfo: FieldInfo) {
         StackValue.field(fieldInfo, generateThisOrOuter(context.thisDescriptor, false)).put(fieldInfo.fieldType, v)

compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/coroutineCodegenUtil.kt

@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.codegen.coroutines
 import com.intellij.openapi.project.Project
 import org.jetbrains.kotlin.backend.common.SUSPEND_WITH_CURRENT_CONTINUATION_NAME
 import org.jetbrains.kotlin.backend.common.getBuiltInSuspendWithCurrentContinuation
+import org.jetbrains.kotlin.builtins.isBuiltinFunctionalType
 import org.jetbrains.kotlin.codegen.binding.CodegenBinding
 import org.jetbrains.kotlin.codegen.state.KotlinTypeMapper
 import org.jetbrains.kotlin.descriptors.*
@@ -32,10 +33,7 @@ import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.BindingTraceContext
 import org.jetbrains.kotlin.resolve.DelegatingBindingTrace
 import org.jetbrains.kotlin.resolve.DescriptorEquivalenceForOverrides
-import org.jetbrains.kotlin.resolve.calls.model.ExpressionValueArgument
-import org.jetbrains.kotlin.resolve.calls.model.MutableDataFlowInfoForArguments
-import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
-import org.jetbrains.kotlin.resolve.calls.model.ResolvedCallImpl
+import org.jetbrains.kotlin.resolve.calls.model.*
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfo
 import org.jetbrains.kotlin.resolve.calls.tasks.TracingStrategy
 import org.jetbrains.kotlin.resolve.descriptorUtil.builtIns
@@ -44,6 +42,7 @@ import org.jetbrains.kotlin.types.KotlinTypeFactory
 import org.jetbrains.kotlin.types.TypeConstructorSubstitution
 import org.jetbrains.kotlin.types.typeUtil.asTypeProjection
 import org.jetbrains.kotlin.util.OperatorNameConventions
+import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 import org.jetbrains.org.objectweb.asm.Opcodes
 import org.jetbrains.org.objectweb.asm.Type
 import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter
@@ -75,6 +74,19 @@ fun ResolvedCall<*>.replaceSuspensionFunctionWithRealDescriptor(
         project: Project,
         bindingContext: BindingContext
 ): ResolvedCallWithRealDescriptor? {
+    if (this is VariableAsFunctionResolvedCall) {
+        val replacedFunctionCall =
+                functionCall.replaceSuspensionFunctionWithRealDescriptor(project, bindingContext)
+                ?: return null
+
+        @Suppress("UNCHECKED_CAST")
+        return replacedFunctionCall.copy(
+                VariableAsFunctionResolvedCallImpl(
+                        replacedFunctionCall.resolvedCall as MutableResolvedCall<FunctionDescriptor>,
+                        variableCall as MutableResolvedCall<VariableDescriptor>
+                )
+        )
+    }
     val function = candidateDescriptor as? SimpleFunctionDescriptor ?: return null
     if (!function.isSuspend || function.getUserData(INITIAL_DESCRIPTOR_FOR_SUSPEND_FUNCTION) != null) return null
 
@@ -119,7 +131,11 @@ fun ResolvedCall<*>.isSuspensionPoint(bindingContext: BindingContext) =
 fun <D : FunctionDescriptor> createJvmSuspendFunctionView(function: D): D {
     val continuationParameter = ValueParameterDescriptorImpl(
             function, null, function.valueParameters.size, Annotations.EMPTY, Name.identifier("\$continuation"),
-            function.getContinuationParameterTypeOfSuspendFunction(),
+            // Add j.l.Object to invoke(), because that is the type of parameters we have in FunctionN+1
+            if (function.containingDeclaration.safeAs<ClassDescriptor>()?.defaultType?.isBuiltinFunctionalType == true)
+                function.builtIns.nullableAnyType
+            else
+                function.getContinuationParameterTypeOfSuspendFunction(),
             /* declaresDefaultValue = */ false, /* isCrossinline = */ false,
             /* isNoinline = */ false, /* varargElementType = */ null, SourceElement.NO_SOURCE
     )

compiler/frontend/src/org/jetbrains/kotlin/resolve/TypeResolver.kt

@@ -220,9 +220,6 @@ class TypeResolver(
                 val receiverTypeRef = type.receiverTypeReference
                 val receiverType = if (receiverTypeRef == null) null else resolveType(c.noBareTypes(), receiverTypeRef)
 
-                if (hasSuspendModifier && type.parameters.isNotEmpty()) {
-                    c.trace.report(UNSUPPORTED.on(type, "suspend function type with value parameters"))
-                }
                 val parameterDescriptors = resolveParametersOfFunctionType(type.parameters)
 
                 val returnTypeRef = type.returnTypeReference

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/tasks/synthesizedInvokes.kt

@@ -18,25 +18,26 @@ package org.jetbrains.kotlin.resolve.calls.tasks
 
 import org.jetbrains.kotlin.builtins.functions.FunctionClassDescriptor
 import org.jetbrains.kotlin.builtins.functions.FunctionClassDescriptor.Kind.Function
+import org.jetbrains.kotlin.builtins.functions.FunctionClassDescriptor.Kind.SuspendFunction
 import org.jetbrains.kotlin.builtins.functions.FunctionInvokeDescriptor
 import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
-import org.jetbrains.kotlin.descriptors.impl.SimpleFunctionDescriptorImpl
-import org.jetbrains.kotlin.descriptors.impl.ValueParameterDescriptorImpl
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.descriptorUtil.setSingleOverridden
 import org.jetbrains.kotlin.types.TypeSubstitutor
 import org.jetbrains.kotlin.util.OperatorNameConventions
 import java.util.*
 
+private val BUILTIN_FUNCTIONS = setOf(Function, SuspendFunction)
+
 fun createSynthesizedInvokes(functions: Collection<FunctionDescriptor>): Collection<FunctionDescriptor> {
     val result = ArrayList<FunctionDescriptor>(1)
 
     for (invoke in functions) {
         if (invoke !is FunctionInvokeDescriptor || invoke.getValueParameters().isEmpty()) continue
 
-        val synthesized = if ((invoke.getContainingDeclaration() as? FunctionClassDescriptor)?.functionKind == Function) {
+        val synthesized = if ((invoke.getContainingDeclaration() as? FunctionClassDescriptor)?.functionKind in BUILTIN_FUNCTIONS) {
             createSynthesizedFunctionWithFirstParameterAsReceiver(invoke)
         }
         else {
@@ -59,40 +60,15 @@ fun createSynthesizedInvokes(functions: Collection<FunctionDescriptor>): Collect
     return result
 }
 
-private fun createSynthesizedFunctionWithFirstParameterAsReceiver(descriptor: FunctionDescriptor): FunctionDescriptor {
-    val result = SimpleFunctionDescriptorImpl.create(
-            descriptor.containingDeclaration,
-            descriptor.annotations,
-            descriptor.name,
-            CallableMemberDescriptor.Kind.SYNTHESIZED,
-            descriptor.source
-    )
-
-    val original = descriptor.original
-    result.initialize(
-            original.valueParameters.first().type,
-            original.dispatchReceiverParameter,
-            original.typeParameters,
-            original.valueParameters.drop(1).map { p ->
-                ValueParameterDescriptorImpl(
-                        result, null, p.index - 1, p.annotations, Name.identifier("p${p.index + 1}"), p.type,
-                        p.declaresDefaultValue(), p.isCrossinline, p.isNoinline, p.varargElementType, p.source
-                )
-            },
-            original.returnType,
-            original.modality,
-            original.visibility
-    )
-    result.isOperator = original.isOperator
-    result.isInfix = original.isInfix
-    result.isExternal = original.isExternal
-    result.isInline = original.isInline
-    result.isTailrec = original.isTailrec
-    result.setHasStableParameterNames(false)
-    result.setHasSynthesizedParameterNames(true)
-
-    return result
-}
+private fun createSynthesizedFunctionWithFirstParameterAsReceiver(descriptor: FunctionDescriptor) =
+    descriptor.original.newCopyBuilder().apply {
+        setExtensionReceiverType(descriptor.original.valueParameters.first().type)
+        setValueParameters(
+                descriptor.original.valueParameters
+                        .drop(1)
+                        .map { p -> p.copy(descriptor.original, Name.identifier("p${p.index + 1}"), p.index - 1) }
+        )
+    }.build()!!
 
 fun isSynthesizedInvoke(descriptor: DeclarationDescriptor): Boolean {
     if (descriptor.name != OperatorNameConventions.INVOKE || descriptor !is FunctionDescriptor) return false

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/tower/InvokeProcessors.kt

@@ -16,7 +16,7 @@
 
 package org.jetbrains.kotlin.resolve.calls.tower
 
-import org.jetbrains.kotlin.builtins.isExtensionFunctionType
+import org.jetbrains.kotlin.builtins.isBuiltinExtensionFunctionalType
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.VariableDescriptor
 import org.jetbrains.kotlin.name.Name
@@ -147,7 +147,7 @@ private fun ImplicitScopeTower.getExtensionInvokeCandidateDescriptor(
         extensionFunctionReceiver: ReceiverValueWithSmartCastInfo
 ): CandidateWithBoundDispatchReceiver<FunctionDescriptor>? {
     val type = extensionFunctionReceiver.receiverValue.type
-    if (!type.isExtensionFunctionType) return null // todo: missing smart cast?
+    if (!type.isBuiltinExtensionFunctionalType) return null // todo: missing smart cast?
 
     val invokeDescriptor = type.memberScope.getContributedFunctions(OperatorNameConventions.INVOKE, location).single()
     val synthesizedInvoke = createSynthesizedInvokes(listOf(invokeDescriptor)).single()
@@ -187,4 +187,4 @@ fun <F : Candidate<FunctionDescriptor>> createCallTowerProcessorForExplicitInvok
         }
     }
 
-}
+}

compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/manyParameters.kt

@@ -0,0 +1,31 @@
+// WITH_RUNTIME
+// WITH_COROUTINES
+// IGNORE_BACKEND: JS
+import kotlin.coroutines.*
+
+suspend fun suspendHere(v: String): String = CoroutineIntrinsics.suspendCoroutineOrReturn { x ->
+    x.resume(v)
+    CoroutineIntrinsics.SUSPENDED
+}
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(EmptyContinuation)
+}
+
+suspend fun foo(c: suspend Double.(Long, Int, String) -> String) = (1.0).c(56L, 55, "abc")
+
+fun box(): String {
+    var result = ""
+    var final = ""
+
+    builder {
+        final = foo { l, i, s ->
+            result = suspendHere("$this#$l#$i#$s")
+            "OK"
+        }
+    }
+
+    if (result != "1.0#56#55#abc") return "fail: $result"
+
+    return final
+}

compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/simple.kt

@@ -0,0 +1,37 @@
+// WITH_RUNTIME
+// WITH_COROUTINES
+// IGNORE_BACKEND: JS
+import kotlin.coroutines.*
+
+suspend fun suspendHere(v: String): String = CoroutineIntrinsics.suspendCoroutineOrReturn { x ->
+    x.resume(v)
+    CoroutineIntrinsics.SUSPENDED
+}
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(EmptyContinuation)
+}
+
+suspend fun foo1(c: suspend () -> Unit) = c()
+suspend fun foo2(c: suspend String.() -> Int) = "2".c()
+suspend fun foo3(c: suspend (String) -> Int) = c("3")
+
+fun box(): String {
+    var result = ""
+
+    builder {
+        foo1 {
+            result = suspendHere("begin#")
+        }
+
+        val q2 = foo2 { result += suspendHere(this) + "#"; 1 }
+        val q3 = foo3 { result += suspendHere(it); 2 }
+
+        if (q2 != 1) throw RuntimeException("fail q2")
+        if (q3 != 2) throw RuntimeException("fail q3")
+    }
+
+    if (result != "begin#2#3") return "fail: $result"
+
+    return "OK"
+}

compiler/testData/codegen/light-analysis/coroutines/suspendFunctionTypeCall/manyParameters.txt

@@ -0,0 +1,20 @@
+public final class CoroutineUtilKt {
+    public final static @org.jetbrains.annotations.NotNull method handleExceptionContinuation(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function1): kotlin.coroutines.Continuation
+    public final static @org.jetbrains.annotations.NotNull method handleResultContinuation(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function1): kotlin.coroutines.Continuation
+}
+
+
+public final class EmptyContinuation {
+    public final static field INSTANCE: EmptyContinuation
+    private method <init>(): void
+    public method resume(@org.jetbrains.annotations.Nullable p0: java.lang.Object): void
+    public method resumeWithException(@org.jetbrains.annotations.NotNull p0: java.lang.Throwable): void
+}
+
+
+public final class ManyParametersKt {
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+    public final static method builder(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function1): void
+    public final static @org.jetbrains.annotations.Nullable method foo(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function5, @org.jetbrains.annotations.NotNull p1: kotlin.coroutines.Continuation): java.lang.Object
+    public final static @org.jetbrains.annotations.Nullable method suspendHere(@org.jetbrains.annotations.NotNull p0: java.lang.String, @org.jetbrains.annotations.NotNull p1: kotlin.coroutines.Continuation): java.lang.Object
+}

compiler/testData/codegen/light-analysis/coroutines/suspendFunctionTypeCall/simple.txt

@@ -0,0 +1,22 @@
+public final class CoroutineUtilKt {
+    public final static @org.jetbrains.annotations.NotNull method handleExceptionContinuation(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function1): kotlin.coroutines.Continuation
+    public final static @org.jetbrains.annotations.NotNull method handleResultContinuation(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function1): kotlin.coroutines.Continuation
+}
+
+
+public final class EmptyContinuation {
+    public final static field INSTANCE: EmptyContinuation
+    private method <init>(): void
+    public method resume(@org.jetbrains.annotations.Nullable p0: java.lang.Object): void
+    public method resumeWithException(@org.jetbrains.annotations.NotNull p0: java.lang.Throwable): void
+}
+
+
+public final class SimpleKt {
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+    public final static method builder(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function1): void
+    public final static @org.jetbrains.annotations.Nullable method foo1(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function1, @org.jetbrains.annotations.NotNull p1: kotlin.coroutines.Continuation): java.lang.Object
+    public final static @org.jetbrains.annotations.Nullable method foo2(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function2, @org.jetbrains.annotations.NotNull p1: kotlin.coroutines.Continuation): java.lang.Object
+    public final static @org.jetbrains.annotations.Nullable method foo3(@org.jetbrains.annotations.NotNull p0: kotlin.jvm.functions.Function2, @org.jetbrains.annotations.NotNull p1: kotlin.coroutines.Continuation): java.lang.Object
+    public final static @org.jetbrains.annotations.Nullable method suspendHere(@org.jetbrains.annotations.NotNull p0: java.lang.String, @org.jetbrains.annotations.NotNull p1: kotlin.coroutines.Continuation): java.lang.Object
+}

compiler/testData/diagnostics/tests/coroutines/inference/withParameter.kt

@@ -4,7 +4,7 @@ class GenericController<T> {
     suspend fun yield(t: T) {}
 }
 
-fun <S, P1, P2, R> generate(p1: P1, p2: List<P2>, g: suspend <!UNSUPPORTED!>GenericController<S>.(P1, P2) -> R<!>): Four<S, P1, P2, R> = TODO()
+fun <S, P1, P2, R> generate(p1: P1, p2: List<P2>, g: suspend GenericController<S>.(P1, P2) -> R): Four<S, P1, P2, R> = TODO()
 
 val test1 = generate(1, listOf("")) { p1, p2 ->
     yield(p1)
@@ -13,4 +13,4 @@ val test1 = generate(1, listOf("")) { p1, p2 ->
 }
 
 fun <X> listOf(vararg x: X): List<X> = TODO()
-class Four<X, Y, Z, T>
+class Four<X, Y, Z, T>

compiler/testData/diagnostics/tests/coroutines/inference/withUninferredParameter.kt

@@ -4,7 +4,7 @@ class GenericController<T> {
     suspend fun yield(t: T) {}
 }
 
-fun <S> generate(g: suspend <!UNSUPPORTED!>GenericController<S>.(S) -> Unit<!>): S = TODO()
+fun <S> generate(g: suspend GenericController<S>.(S) -> Unit): S = TODO()
 
 val test1 = <!TYPE_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>generate<!> {
     yield(4)

compiler/testData/diagnostics/tests/coroutines/lambdaExpectedType.kt

@@ -12,7 +12,7 @@ fun <T> manyArgumentsBuilder(
         c3: suspend () -> Int
 ):T = null!!
 
-fun severalParamsInLambda(c: suspend <!UNSUPPORTED!>(String, Int) -> Unit<!>) {}
+fun severalParamsInLambda(c: suspend (String, Int) -> Unit) {}
 
 fun foo() {
     builder({ 1 })

compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/inference1.kt

@@ -1,7 +1,7 @@
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
-fun <T> withS(x: T, sfn: suspend <!UNSUPPORTED!>(T) -> Unit<!>) = x
+fun <T> withS(x: T, sfn: suspend (T) -> Unit) = x
 
 val test1 = withS(100) {}
 
-fun <TT> test2(x: TT) = withS(x) {}
+fun <TT> test2(x: TT) = withS(x) {}

compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/inference2.kt

@@ -1,5 +1,5 @@
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
-fun <T1, T2> withS2(x: T1, sfn1: suspend <!UNSUPPORTED!>(T1) -> T2<!>, sfn2: suspend <!UNSUPPORTED!>(T2) -> Unit<!>): T2 = null!!
+fun <T1, T2> withS2(x: T1, sfn1: suspend (T1) -> T2, sfn2: suspend (T2) -> Unit): T2 = null!!
 
-val test1 = withS2(100, { it.toLong().toString() }, { it.length })
+val test1 = withS2(100, { it.toLong().toString() }, { it.length })

compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/invoke.kt

@@ -0,0 +1,10 @@
+suspend fun foo1(q: suspend () -> Unit) = q()
+suspend fun foo2(x: suspend (Int) -> String) = x(1)
+
+
+suspend fun foo3(y: suspend String.(Int) -> Double) = "".y(1)
+suspend fun String.foo4(y: suspend String.(Int) -> Double) = "".y(1)
+
+fun noSuspend(x: suspend (Int) -> String) {
+    <!ILLEGAL_SUSPEND_FUNCTION_CALL!>x<!>(1)
+}

compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/invoke.txt

@@ -0,0 +1,7 @@
+package
+
+public suspend fun foo1(/*0*/ q: suspend () -> kotlin.Unit): kotlin.Unit
+public suspend fun foo2(/*0*/ x: suspend (kotlin.Int) -> kotlin.String): kotlin.String
+public suspend fun foo3(/*0*/ y: suspend kotlin.String.(kotlin.Int) -> kotlin.Double): kotlin.Double
+public fun noSuspend(/*0*/ x: suspend (kotlin.Int) -> kotlin.String): kotlin.Unit
+public suspend fun kotlin.String.foo4(/*0*/ y: suspend kotlin.String.(kotlin.Int) -> kotlin.Double): kotlin.Double

compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/lambdaInValInitializer.kt

@@ -2,5 +2,5 @@ typealias SuspendFn = suspend () -> Unit
 
 val test1: suspend () -> Unit = {}
 val test2: suspend Any.() -> Unit = {}
-val test3: suspend <!UNSUPPORTED!>Any.(Int) -> Int<!> = { k: Int -> k + 1 }
-val test4: SuspendFn = {}
+val test3: suspend Any.(Int) -> Int = { k: Int -> k + 1 }
+val test4: SuspendFn = {}

compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/modifierApplicability.kt

@@ -12,7 +12,7 @@ typealias Test5 = List<suspend () -> Unit>
 typealias Test6 = <!WRONG_MODIFIER_TARGET!>suspend<!> List<() -> Unit>
 typealias Test7 = <!WRONG_MODIFIER_TARGET!>suspend<!> SAM
 typealias Test8 = <!WRONG_MODIFIER_TARGET!>suspend<!> <!UNRESOLVED_REFERENCE!>SuspendFunction0<!><Unit>
-typealias Test9 = suspend <!UNSUPPORTED!>(() -> Unit) -> Unit<!>
-typealias Test10 = suspend <!UNSUPPORTED!>(suspend () -> Unit) -> Unit<!>
+typealias Test9 = suspend (() -> Unit) -> Unit
+typealias Test10 = suspend (suspend () -> Unit) -> Unit
 typealias Test11 = suspend () -> (suspend () -> Unit)
-typealias Test12 = suspend <!UNSUPPORTED!>(suspend (() -> Unit)) -> Unit<!>
+typealias Test12 = suspend (suspend (() -> Unit)) -> Unit

compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/noInvokeForSuspendFunction.kt

@@ -1,2 +1,2 @@
-fun test1(sfn: suspend () -> Unit) = <!FUNCTION_EXPECTED!>sfn<!>()
-fun test2(sfn: suspend () -> Unit) = sfn.<!UNRESOLVED_REFERENCE!>invoke<!>()
+fun test1(sfn: suspend () -> Unit) = <!ILLEGAL_SUSPEND_FUNCTION_CALL!>sfn<!>()
+fun test2(sfn: suspend () -> Unit) = sfn.<!ILLEGAL_SUSPEND_FUNCTION_CALL!>invoke<!>()

compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/noInvokeForSuspendFunction.txt

@@ -1,4 +1,4 @@
 package
 
-public fun test1(/*0*/ sfn: suspend () -> kotlin.Unit): [ERROR : Error function type]
-public fun test2(/*0*/ sfn: suspend () -> kotlin.Unit): [ERROR : Error function type]
+public fun test1(/*0*/ sfn: suspend () -> kotlin.Unit): kotlin.Unit
+public fun test2(/*0*/ sfn: suspend () -> kotlin.Unit): kotlin.Unit

compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/noValueParameters.kt

@@ -1,4 +1,4 @@
-typealias Test1 = suspend <!UNSUPPORTED!>(Int) -> Unit<!>
-typealias Test2 = suspend <!UNSUPPORTED!>Int.(Int) -> Unit<!>
-typealias Test3 = List<suspend <!UNSUPPORTED!>(Int) -> Unit<!>>
-typealias Test4 = List<suspend <!UNSUPPORTED!>Int.(Int) -> Unit<!>>
+typealias Test1 = suspend (Int) -> Unit
+typealias Test2 = suspend Int.(Int) -> Unit
+typealias Test3 = List<suspend (Int) -> Unit>
+typealias Test4 = List<suspend Int.(Int) -> Unit>

compiler/tests-ir-jvm/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -4973,6 +4973,27 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             }
         }
 
+        @TestMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class SuspendFunctionTypeCall extends AbstractIrBlackBoxCodegenTest {
+            public void testAllFilesPresentInSuspendFunctionTypeCall() throws Exception {
+                KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JVM, true);
+            }
+
+            @TestMetadata("manyParameters.kt")
+            public void testManyParameters() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/manyParameters.kt");
+                doTest(fileName);
+            }
+
+            @TestMetadata("simple.kt")
+            public void testSimple() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/simple.kt");
+                doTest(fileName);
+            }
+        }
+
         @TestMetadata("compiler/testData/codegen/box/coroutines/unitTypeReturn")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)

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

@@ -4506,6 +4506,12 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                     doTest(fileName);
                 }
 
+                @TestMetadata("invoke.kt")
+                public void testInvoke() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/invoke.kt");
+                    doTest(fileName);
+                }
+
                 @TestMetadata("lambdaInOverriddenValInitializer.kt")
                 public void testLambdaInOverriddenValInitializer() throws Exception {
                     String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/coroutines/suspendFunctionType/lambdaInOverriddenValInitializer.kt");

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -4973,6 +4973,27 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             }
         }
 
+        @TestMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class SuspendFunctionTypeCall extends AbstractBlackBoxCodegenTest {
+            public void testAllFilesPresentInSuspendFunctionTypeCall() throws Exception {
+                KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JVM, true);
+            }
+
+            @TestMetadata("manyParameters.kt")
+            public void testManyParameters() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/manyParameters.kt");
+                doTest(fileName);
+            }
+
+            @TestMetadata("simple.kt")
+            public void testSimple() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/simple.kt");
+                doTest(fileName);
+            }
+        }
+
         @TestMetadata("compiler/testData/codegen/box/coroutines/unitTypeReturn")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeCodegenTestGenerated.java

@@ -4973,6 +4973,27 @@ public class LightAnalysisModeCodegenTestGenerated extends AbstractLightAnalysis
             }
         }
 
+        @TestMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class SuspendFunctionTypeCall extends AbstractLightAnalysisModeCodegenTest {
+            public void testAllFilesPresentInSuspendFunctionTypeCall() throws Exception {
+                KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JVM, true);
+            }
+
+            @TestMetadata("manyParameters.kt")
+            public void testManyParameters() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/manyParameters.kt");
+                doTest(fileName);
+            }
+
+            @TestMetadata("simple.kt")
+            public void testSimple() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/simple.kt");
+                doTest(fileName);
+            }
+        }
+
         @TestMetadata("compiler/testData/codegen/box/coroutines/unitTypeReturn")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)

core/descriptors/src/org/jetbrains/kotlin/builtins/functions/FunctionClassScope.kt

@@ -25,8 +25,9 @@ class FunctionClassScope(
         containingClass: FunctionClassDescriptor
 ) : GivenFunctionsMemberScope(storageManager, containingClass) {
     override fun computeDeclaredFunctions(): List<FunctionDescriptor> =
-            if ((containingClass as FunctionClassDescriptor).functionKind == FunctionClassDescriptor.Kind.Function) {
-                listOf(FunctionInvokeDescriptor.create(containingClass))
+            when ((containingClass as FunctionClassDescriptor).functionKind) {
+                FunctionClassDescriptor.Kind.Function -> listOf(FunctionInvokeDescriptor.create(containingClass, isSuspend = false))
+                FunctionClassDescriptor.Kind.SuspendFunction -> listOf(FunctionInvokeDescriptor.create(containingClass, isSuspend = true))
+                else -> emptyList()
             }
-            else emptyList()
 }

core/descriptors/src/org/jetbrains/kotlin/builtins/functions/FunctionInvokeDescriptor.kt

@@ -30,7 +30,8 @@ import org.jetbrains.kotlin.util.OperatorNameConventions
 class FunctionInvokeDescriptor private constructor(
         container: DeclarationDescriptor,
         original: FunctionInvokeDescriptor?,
-        callableKind: CallableMemberDescriptor.Kind
+        callableKind: CallableMemberDescriptor.Kind,
+        isSuspend: Boolean
 ) : SimpleFunctionDescriptorImpl(
         container,
         original,
@@ -41,6 +42,7 @@ class FunctionInvokeDescriptor private constructor(
 ) {
     init {
         this.isOperator = true
+        this.isSuspend = isSuspend
         this.setHasStableParameterNames(false)
     }
 
@@ -59,7 +61,7 @@ class FunctionInvokeDescriptor private constructor(
             annotations: Annotations,
             source: SourceElement
     ): FunctionDescriptorImpl {
-        return FunctionInvokeDescriptor(newOwner, original as FunctionInvokeDescriptor?, kind)
+        return FunctionInvokeDescriptor(newOwner, original as FunctionInvokeDescriptor?, kind, isSuspend)
     }
 
     override fun isExternal(): Boolean = false
@@ -94,10 +96,10 @@ class FunctionInvokeDescriptor private constructor(
     }
 
     companion object Factory {
-        fun create(functionClass: FunctionClassDescriptor): FunctionInvokeDescriptor {
+        fun create(functionClass: FunctionClassDescriptor, isSuspend: Boolean): FunctionInvokeDescriptor {
             val typeParameters = functionClass.declaredTypeParameters
 
-            val result = FunctionInvokeDescriptor(functionClass, null, CallableMemberDescriptor.Kind.DECLARATION)
+            val result = FunctionInvokeDescriptor(functionClass, null, CallableMemberDescriptor.Kind.DECLARATION, isSuspend)
             result.initialize(
                     null,
                     functionClass.thisAsReceiverParameter,

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java

@@ -5760,6 +5760,39 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             }
         }
 
+        @TestMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class SuspendFunctionTypeCall extends AbstractJsCodegenBoxTest {
+            public void testAllFilesPresentInSuspendFunctionTypeCall() throws Exception {
+                KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.JS, true);
+            }
+
+            @TestMetadata("manyParameters.kt")
+            public void testManyParameters() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/manyParameters.kt");
+                try {
+                    doTest(fileName);
+                }
+                catch (Throwable ignore) {
+                    return;
+                }
+                throw new AssertionError("Looks like this test can be unmuted. Remove IGNORE_BACKEND directive for that.");
+            }
+
+            @TestMetadata("simple.kt")
+            public void testSimple() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/suspendFunctionTypeCall/simple.kt");
+                try {
+                    doTest(fileName);
+                }
+                catch (Throwable ignore) {
+                    return;
+                }
+                throw new AssertionError("Looks like this test can be unmuted. Remove IGNORE_BACKEND directive for that.");
+            }
+        }
+
         @TestMetadata("compiler/testData/codegen/box/coroutines/unitTypeReturn")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)