test(KT-47096): add tests for the uncovered behavior.

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java

@@ -43934,6 +43934,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/vararg/spreadCopiesArray.kt");
         }
 
+        @Test
+        @TestMetadata("useSuspendFunResultAsVararg.kt")
+        public void testUseSuspendFunResultAsVararg() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/useSuspendFunResultAsVararg.kt");
+        }
+
         @Test
         @TestMetadata("varargInFunParam.kt")
         public void testVarargInFunParam() throws Exception {

compiler/testData/codegen/box/vararg/useSuspendFunResultAsVararg.kt

@@ -0,0 +1,36 @@
+// WITH_RUNTIME
+// WITH_COROUTINES
+
+import helpers.*
+import kotlin.coroutines.*
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(EmptyContinuation)
+}
+
+class TodoItem(var value: String, var completed: Boolean) {
+    override fun toString(): String {
+        return "TodoItem(value='$value', completed=$completed)"
+    }
+}
+
+suspend fun getFromApi(): TodoItem {
+    return TodoItem("Test", false)
+}
+
+fun emulateLog(vararg strings: String): String {
+    return strings[0]
+}
+
+fun box(): String {
+    var stringifiedResult = ""
+
+    builder {
+        stringifiedResult = emulateLog("Result: " + getFromApi())
+    }
+
+    if (stringifiedResult != "Result: TodoItem(value='Test', completed=false)") {
+        return "Failed: Unexpected result ($stringifiedResult)"
+    }
+    return "OK"
+}

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java

@@ -43772,6 +43772,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/vararg/spreadCopiesArray.kt");
         }
 
+        @Test
+        @TestMetadata("useSuspendFunResultAsVararg.kt")
+        public void testUseSuspendFunResultAsVararg() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/useSuspendFunResultAsVararg.kt");
+        }
+
         @Test
         @TestMetadata("varargInFunParam.kt")
         public void testVarargInFunParam() throws Exception {

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java

@@ -43934,6 +43934,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/vararg/spreadCopiesArray.kt");
         }
 
+        @Test
+        @TestMetadata("useSuspendFunResultAsVararg.kt")
+        public void testUseSuspendFunResultAsVararg() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/useSuspendFunResultAsVararg.kt");
+        }
+
         @Test
         @TestMetadata("varargInFunParam.kt")
         public void testVarargInFunParam() throws Exception {

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

@@ -35355,6 +35355,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/vararg/spreadCopiesArray.kt");
         }
 
+        @TestMetadata("useSuspendFunResultAsVararg.kt")
+        public void testUseSuspendFunResultAsVararg() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/useSuspendFunResultAsVararg.kt");
+        }
+
         @TestMetadata("varargInFunParam.kt")
         public void testVarargInFunParam() throws Exception {
             runTest("compiler/testData/codegen/box/vararg/varargInFunParam.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java

@@ -29325,6 +29325,11 @@ public class IrJsCodegenBoxES6TestGenerated extends AbstractIrJsCodegenBoxES6Tes
             runTest("compiler/testData/codegen/box/vararg/spreadCopiesArray.kt");
         }
 
+        @TestMetadata("useSuspendFunResultAsVararg.kt")
+        public void testUseSuspendFunResultAsVararg() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/useSuspendFunResultAsVararg.kt");
+        }
+
         @TestMetadata("varargInFunParam.kt")
         public void testVarargInFunParam() throws Exception {
             runTest("compiler/testData/codegen/box/vararg/varargInFunParam.kt");

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

@@ -28731,6 +28731,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/vararg/spreadCopiesArray.kt");
         }
 
+        @TestMetadata("useSuspendFunResultAsVararg.kt")
+        public void testUseSuspendFunResultAsVararg() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/useSuspendFunResultAsVararg.kt");
+        }
+
         @TestMetadata("varargInFunParam.kt")
         public void testVarargInFunParam() throws Exception {
             runTest("compiler/testData/codegen/box/vararg/varargInFunParam.kt");

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

@@ -28646,6 +28646,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/vararg/spreadCopiesArray.kt");
         }
 
+        @TestMetadata("useSuspendFunResultAsVararg.kt")
+        public void testUseSuspendFunResultAsVararg() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/useSuspendFunResultAsVararg.kt");
+        }
+
         @TestMetadata("varargInFunParam.kt")
         public void testVarargInFunParam() throws Exception {
             runTest("compiler/testData/codegen/box/vararg/varargInFunParam.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java

@@ -25067,6 +25067,11 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/vararg/spreadCopiesArray.kt");
         }
 
+        @TestMetadata("useSuspendFunResultAsVararg.kt")
+        public void testUseSuspendFunResultAsVararg() throws Exception {
+            runTest("compiler/testData/codegen/box/vararg/useSuspendFunResultAsVararg.kt");
+        }
+
         @TestMetadata("varargInFunParam.kt")
         public void testVarargInFunParam() throws Exception {
             runTest("compiler/testData/codegen/box/vararg/varargInFunParam.kt");