Check default parameters of expect suspend functions on original

functions instead of function views.
 #KT-24461 Fixed

compiler/backend/src/org/jetbrains/kotlin/codegen/FunctionCodegen.java

@@ -1323,7 +1323,9 @@ public class FunctionCodegen {
 
     private boolean isDefaultNeeded(@NotNull FunctionDescriptor descriptor, @Nullable KtNamedFunction function) {
         List<ValueParameterDescriptor> parameters =
-                CodegenUtil.getFunctionParametersForDefaultValueGeneration(descriptor, state.getDiagnostics());
+                CodegenUtil.getFunctionParametersForDefaultValueGeneration(
+                        descriptor.isSuspend() ? CoroutineCodegenUtilKt.unwrapInitialDescriptorForSuspendFunction(descriptor) : descriptor,
+                        state.getDiagnostics());
         return CollectionsKt.any(parameters, ValueParameterDescriptor::declaresDefaultValue);
     }
 

compiler/testData/codegen/box/multiplatform/defaultArguments/suspend.kt

@@ -0,0 +1,34 @@
+// !LANGUAGE: +MultiPlatformProjects
+// IGNORE_BACKEND: NATIVE
+// WITH_RUNTIME
+// WITH_COROUTINES
+
+// FILE: lib.kt
+
+expect interface I {
+    suspend fun f(p: Int = 1): String
+}
+
+// FILE: main.kt
+import kotlin.coroutines.*
+import helpers.*
+
+actual interface I {
+    actual suspend fun f(p: Int): String
+}
+
+class II : I {
+    override suspend fun f(p: Int): String = "OK"
+}
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(EmptyContinuation)
+}
+
+fun box(): String {
+    var res = "FAIL"
+    builder {
+        res = II().f()
+    }
+    return res
+}

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

@@ -16638,6 +16638,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/superCall.kt");
             }
 
+            @TestMetadata("suspend.kt")
+            public void testSuspend() throws Exception {
+                runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/suspend.kt");
+            }
+
             @TestMetadata("typeAlias.kt")
             public void testTypeAlias() throws Exception {
                 runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/typeAlias.kt");

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

@@ -16638,6 +16638,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
                 runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/parametersInArgumentValues.kt");
             }
 
+            @TestMetadata("suspend.kt")
+            public void testSuspend() throws Exception {
+                runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/suspend.kt");
+            }
+
             @TestMetadata("typeAlias.kt")
             public void testTypeAlias() throws Exception {
                 runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/typeAlias.kt");

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

@@ -15523,6 +15523,11 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
                 runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/superCall.kt");
             }
 
+            @TestMetadata("suspend.kt")
+            public void testSuspend() throws Exception {
+                runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/suspend.kt");
+            }
+
             @TestMetadata("typeAlias.kt")
             public void testTypeAlias() throws Exception {
                 runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/typeAlias.kt");

js/js.tests/test/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java

@@ -12738,6 +12738,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
                 runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/superCall.kt");
             }
 
+            @TestMetadata("suspend.kt")
+            public void testSuspend() throws Exception {
+                runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/suspend.kt");
+            }
+
             @TestMetadata("typeAlias.kt")
             public void testTypeAlias() throws Exception {
                 runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/typeAlias.kt");

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

@@ -13853,6 +13853,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
                 runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/superCall.kt");
             }
 
+            @TestMetadata("suspend.kt")
+            public void testSuspend() throws Exception {
+                runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/suspend.kt");
+            }
+
             @TestMetadata("typeAlias.kt")
             public void testTypeAlias() throws Exception {
                 runTest("compiler/testData/codegen/box/multiplatform/defaultArguments/typeAlias.kt");