[FIR] Handle ConeIntersectionType in createSimpleType

^KT-62819 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosticCompilerTestFE10TestdataTestGenerated.java

@@ -15912,6 +15912,12 @@ public class DiagnosticCompilerTestFE10TestdataTestGenerated extends AbstractDia
                 runTest("compiler/testData/diagnostics/tests/inference/intersectionTypeMultipleBoundsAsReceiver.kt");
             }
 
+            @Test
+            @TestMetadata("intersectionTypeOnWhenCall.kt")
+            public void testIntersectionTypeOnWhenCall() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/inference/intersectionTypeOnWhenCall.kt");
+            }
+
             @Test
             @TestMetadata("intersectionTypesWithContravariantTypes.kt")
             public void testIntersectionTypesWithContravariantTypes() throws Exception {

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java

@@ -15912,6 +15912,12 @@ public class LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated
                 runTest("compiler/testData/diagnostics/tests/inference/intersectionTypeMultipleBoundsAsReceiver.kt");
             }
 
+            @Test
+            @TestMetadata("intersectionTypeOnWhenCall.kt")
+            public void testIntersectionTypeOnWhenCall() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/inference/intersectionTypeOnWhenCall.kt");
+            }
+
             @Test
             @TestMetadata("intersectionTypesWithContravariantTypes.kt")
             public void testIntersectionTypesWithContravariantTypes() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirLightTreeOldFrontendDiagnosticsTestGenerated.java

@@ -15906,6 +15906,12 @@ public class FirLightTreeOldFrontendDiagnosticsTestGenerated extends AbstractFir
                 runTest("compiler/testData/diagnostics/tests/inference/intersectionTypeMultipleBoundsAsReceiver.kt");
             }
 
+            @Test
+            @TestMetadata("intersectionTypeOnWhenCall.kt")
+            public void testIntersectionTypeOnWhenCall() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/inference/intersectionTypeOnWhenCall.kt");
+            }
+
             @Test
             @TestMetadata("intersectionTypesWithContravariantTypes.kt")
             public void testIntersectionTypesWithContravariantTypes() throws Exception {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirPsiOldFrontendDiagnosticsTestGenerated.java

@@ -15912,6 +15912,12 @@ public class FirPsiOldFrontendDiagnosticsTestGenerated extends AbstractFirPsiDia
                 runTest("compiler/testData/diagnostics/tests/inference/intersectionTypeMultipleBoundsAsReceiver.kt");
             }
 
+            @Test
+            @TestMetadata("intersectionTypeOnWhenCall.kt")
+            public void testIntersectionTypeOnWhenCall() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/inference/intersectionTypeOnWhenCall.kt");
+            }
+
             @Test
             @TestMetadata("intersectionTypesWithContravariantTypes.kt")
             public void testIntersectionTypesWithContravariantTypes() throws Exception {

compiler/fir/providers/src/org/jetbrains/kotlin/fir/types/ConeInferenceContext.kt

@@ -95,9 +95,16 @@ interface ConeInferenceContext : TypeSystemInferenceExtensionContext, ConeTypeCo
                 nullable,
                 coneAttributes
             )
+            is ConeIntersectionType -> if (coneAttributes === constructor.attributes) {
+                constructor
+            } else {
+                ConeIntersectionType(
+                    constructor.intersectedTypes.map { it.withAttributes(coneAttributes) },
+                    constructor.alternativeType?.withAttributes(coneAttributes)
+                )
+            }
             else -> error("!")
         }
-
     }
 
     override fun createTypeArgument(type: KotlinTypeMarker, variance: TypeVariance): TypeArgumentMarker {

compiler/testData/diagnostics/tests/inference/intersectionTypeOnWhenCall.kt

@@ -0,0 +1,16 @@
+// FIR_IDENTICAL
+// ISSUE: KT-62819
+
+class A<T>
+
+fun foo(cond: Boolean) {
+    val first = when (cond) {
+        true -> A<Int>()
+        false -> A<String?>()
+    }
+
+    val second = when (cond) {
+        true -> first
+        false -> first
+    }
+}

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

@@ -15912,6 +15912,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                 runTest("compiler/testData/diagnostics/tests/inference/intersectionTypeMultipleBoundsAsReceiver.kt");
             }
 
+            @Test
+            @TestMetadata("intersectionTypeOnWhenCall.kt")
+            public void testIntersectionTypeOnWhenCall() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/inference/intersectionTypeOnWhenCall.kt");
+            }
+
             @Test
             @TestMetadata("intersectionTypesWithContravariantTypes.kt")
             public void testIntersectionTypesWithContravariantTypes() throws Exception {