Add regression test for already fixed issue KT-41396

compiler/fir/analysis-tests/tests/org/jetbrains/kotlin/fir/FirOldFrontendDiagnosticsTestWithStdlibGenerated.java

@@ -2116,6 +2116,11 @@ public class FirOldFrontendDiagnosticsTestWithStdlibGenerated extends AbstractFi
                 runTest("compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/kt41308.kt");
             }
 
+            @TestMetadata("kt41396.kt")
+            public void testKt41396() throws Exception {
+                runTest("compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/kt41396.kt");
+            }
+
             @TestMetadata("nestedLambdaInferenceWithListMap.kt")
             public void testNestedLambdaInferenceWithListMap() throws Exception {
                 runTest("compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/nestedLambdaInferenceWithListMap.kt");

compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/kt41396.kt

@@ -0,0 +1,22 @@
+// FIR_IDENTICAL
+// !DIAGNOSTICS: -EXPERIMENTAL_API_USAGE_ERROR -UNUSED_PARAMETER -CAST_NEVER_SUCCEEDS
+
+fun <T, R> Flow<T>.transformLatest(@BuilderInference transform: suspend FlowCollector<R>.(value: T) -> Unit) = null as Flow<R>
+
+interface Flow<out T> {
+    suspend fun collect(collector: FlowCollector<T>)
+}
+
+interface FlowCollector<in T> {
+    suspend fun emit(value: T)
+}
+
+fun <T> flow(@BuilderInference block: suspend FlowCollector<T>.() -> Unit) = null as Flow<T>
+fun <T> flowOf(value: T) = null as Flow<T>
+
+fun foo() = flow {
+    flowOf(false).transformLatest {
+        emit(false)
+    }
+    emit(0)
+}

compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/kt41396.txt

@@ -0,0 +1,20 @@
+package
+
+public fun </*0*/ T> flow(/*0*/ @kotlin.BuilderInference block: suspend FlowCollector<T>.() -> kotlin.Unit): Flow<T>
+public fun </*0*/ T> flowOf(/*0*/ value: T): Flow<T>
+public fun foo(): Flow<kotlin.Int>
+public fun </*0*/ T, /*1*/ R> Flow<T>.transformLatest(/*0*/ @kotlin.BuilderInference transform: suspend FlowCollector<R>.(value: T) -> kotlin.Unit): Flow<R>
+
+public interface Flow</*0*/ out T> {
+    public abstract suspend fun collect(/*0*/ collector: FlowCollector<T>): kotlin.Unit
+    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 interface FlowCollector</*0*/ in T> {
+    public abstract suspend fun emit(/*0*/ value: T): kotlin.Unit
+    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/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestWithStdLibGenerated.java

@@ -2156,6 +2156,11 @@ public class DiagnosticsTestWithStdLibGenerated extends AbstractDiagnosticsTestW
                 runTest("compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/kt41308.kt");
             }
 
+            @TestMetadata("kt41396.kt")
+            public void testKt41396() throws Exception {
+                runTest("compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/kt41396.kt");
+            }
+
             @TestMetadata("nestedLambdaInferenceWithListMap.kt")
             public void testNestedLambdaInferenceWithListMap() throws Exception {
                 runTest("compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/nestedLambdaInferenceWithListMap.kt");

compiler/tests/org/jetbrains/kotlin/checkers/javac/DiagnosticsTestWithStdLibUsingJavacGenerated.java

@@ -2156,6 +2156,11 @@ public class DiagnosticsTestWithStdLibUsingJavacGenerated extends AbstractDiagno
                 runTest("compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/kt41308.kt");
             }
 
+            @TestMetadata("kt41396.kt")
+            public void testKt41396() throws Exception {
+                runTest("compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/kt41396.kt");
+            }
+
             @TestMetadata("nestedLambdaInferenceWithListMap.kt")
             public void testNestedLambdaInferenceWithListMap() throws Exception {
                 runTest("compiler/testData/diagnostics/testsWithStdLib/coroutines/inference/nestedLambdaInferenceWithListMap.kt");