FIR: copy nullability when mapping type alias arguments

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

@@ -37780,6 +37780,12 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
                 runTest("compiler/testData/codegen/box/typealias/typeAliasConstructorInSuperCall.kt");
             }
 
+            @Test
+            @TestMetadata("typeAliasFunction.kt")
+            public void testTypeAliasFunction() throws Exception {
+                runTest("compiler/testData/codegen/box/typealias/typeAliasFunction.kt");
+            }
+
             @Test
             @TestMetadata("typeAliasInAnonymousObjectType.kt")
             public void testTypeAliasInAnonymousObjectType() throws Exception {

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/TypeExpansionUtils.kt

@@ -85,11 +85,10 @@ private fun mapTypeAliasArguments(
             val type = (projection as? ConeKotlinTypeProjection)?.type ?: return null
             val symbol = (type as? ConeTypeParameterType)?.lookupTag?.symbol ?: return super.substituteArgument(projection)
             val mappedProjection = typeAliasMap[symbol] ?: return super.substituteArgument(projection)
-            val mappedType = (mappedProjection as? ConeKotlinTypeProjection)?.type ?: return mappedProjection
+            val mappedType = (mappedProjection as? ConeKotlinTypeProjection)?.type.updateNullabilityIfNeeded(type)
+                ?: return mappedProjection
 
-            @Suppress("MoveVariableDeclarationIntoWhen")
-            val resultingKind = mappedProjection.kind + projection.kind
-            return when (resultingKind) {
+            return when (mappedProjection.kind + projection.kind) {
                 ProjectionKind.STAR -> ConeStarProjection
                 ProjectionKind.IN -> ConeKotlinTypeProjectionIn(mappedType)
                 ProjectionKind.OUT -> ConeKotlinTypeProjectionOut(mappedType)

compiler/testData/codegen/box/typealias/typeAliasFunction.kt

@@ -0,0 +1,5 @@
+typealias F<X> = (X?) -> X
+
+fun <T> invoke(f: F<T>) = f(null)
+
+fun box() = invoke<String> { it ?: "OK" }

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

@@ -37980,6 +37980,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 runTest("compiler/testData/codegen/box/typealias/typeAliasConstructorInSuperCall.kt");
             }
 
+            @Test
+            @TestMetadata("typeAliasFunction.kt")
+            public void testTypeAliasFunction() throws Exception {
+                runTest("compiler/testData/codegen/box/typealias/typeAliasFunction.kt");
+            }
+
             @Test
             @TestMetadata("typeAliasInAnonymousObjectType.kt")
             public void testTypeAliasInAnonymousObjectType() throws Exception {

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

@@ -37780,6 +37780,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
                 runTest("compiler/testData/codegen/box/typealias/typeAliasConstructorInSuperCall.kt");
             }
 
+            @Test
+            @TestMetadata("typeAliasFunction.kt")
+            public void testTypeAliasFunction() throws Exception {
+                runTest("compiler/testData/codegen/box/typealias/typeAliasFunction.kt");
+            }
+
             @Test
             @TestMetadata("typeAliasInAnonymousObjectType.kt")
             public void testTypeAliasInAnonymousObjectType() throws Exception {

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

@@ -30439,6 +30439,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/typealias/typeAliasConstructorInSuperCall.kt");
         }
 
+        @TestMetadata("typeAliasFunction.kt")
+        public void testTypeAliasFunction() throws Exception {
+            runTest("compiler/testData/codegen/box/typealias/typeAliasFunction.kt");
+        }
+
         @TestMetadata("typeAliasInAnonymousObjectType.kt")
         public void testTypeAliasInAnonymousObjectType() throws Exception {
             runTest("compiler/testData/codegen/box/typealias/typeAliasInAnonymousObjectType.kt");

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

@@ -26615,6 +26615,11 @@ public class IrJsCodegenBoxES6TestGenerated extends AbstractIrJsCodegenBoxES6Tes
             runTest("compiler/testData/codegen/box/typealias/typeAliasConstructorInSuperCall.kt");
         }
 
+        @TestMetadata("typeAliasFunction.kt")
+        public void testTypeAliasFunction() throws Exception {
+            runTest("compiler/testData/codegen/box/typealias/typeAliasFunction.kt");
+        }
+
         @TestMetadata("typeAliasInAnonymousObjectType.kt")
         public void testTypeAliasInAnonymousObjectType() throws Exception {
             runTest("compiler/testData/codegen/box/typealias/typeAliasInAnonymousObjectType.kt");

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

@@ -26100,6 +26100,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/typealias/typeAliasConstructorInSuperCall.kt");
         }
 
+        @TestMetadata("typeAliasFunction.kt")
+        public void testTypeAliasFunction() throws Exception {
+            runTest("compiler/testData/codegen/box/typealias/typeAliasFunction.kt");
+        }
+
         @TestMetadata("typeAliasInAnonymousObjectType.kt")
         public void testTypeAliasInAnonymousObjectType() throws Exception {
             runTest("compiler/testData/codegen/box/typealias/typeAliasInAnonymousObjectType.kt");

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

@@ -26065,6 +26065,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/typealias/typeAliasConstructorInSuperCall.kt");
         }
 
+        @TestMetadata("typeAliasFunction.kt")
+        public void testTypeAliasFunction() throws Exception {
+            runTest("compiler/testData/codegen/box/typealias/typeAliasFunction.kt");
+        }
+
         @TestMetadata("typeAliasInAnonymousObjectType.kt")
         public void testTypeAliasInAnonymousObjectType() throws Exception {
             runTest("compiler/testData/codegen/box/typealias/typeAliasInAnonymousObjectType.kt");

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

@@ -14381,6 +14381,11 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/typealias/typeAliasConstructorInSuperCall.kt");
         }
 
+        @TestMetadata("typeAliasFunction.kt")
+        public void testTypeAliasFunction() throws Exception {
+            runTest("compiler/testData/codegen/box/typealias/typeAliasFunction.kt");
+        }
+
         @TestMetadata("typeAliasInAnonymousObjectType.kt")
         public void testTypeAliasInAnonymousObjectType() throws Exception {
             runTest("compiler/testData/codegen/box/typealias/typeAliasInAnonymousObjectType.kt");