[FE 1.0] Keep the same type attributes during union or intersection type attributes

^KT-51317 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -11472,6 +11472,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/tests/functionLiterals/kt47493.kt");
             }
 
+            @Test
+            @TestMetadata("kt51317.kt")
+            public void testKt51317() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/functionLiterals/kt51317.kt");
+            }
+
             @Test
             @TestMetadata("kt6541_extensionForExtensionFunction.kt")
             public void testKt6541_extensionForExtensionFunction() throws Exception {

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

@@ -11472,6 +11472,12 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirDiagnosti
                 runTest("compiler/testData/diagnostics/tests/functionLiterals/kt47493.kt");
             }
 
+            @Test
+            @TestMetadata("kt51317.kt")
+            public void testKt51317() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/functionLiterals/kt51317.kt");
+            }
+
             @Test
             @TestMetadata("kt6541_extensionForExtensionFunction.kt")
             public void testKt6541_extensionForExtensionFunction() throws Exception {

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

@@ -11472,6 +11472,12 @@ public class FirOldFrontendDiagnosticsWithLightTreeTestGenerated extends Abstrac
                 runTest("compiler/testData/diagnostics/tests/functionLiterals/kt47493.kt");
             }
 
+            @Test
+            @TestMetadata("kt51317.kt")
+            public void testKt51317() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/functionLiterals/kt51317.kt");
+            }
+
             @Test
             @TestMetadata("kt6541_extensionForExtensionFunction.kt")
             public void testKt6541_extensionForExtensionFunction() throws Exception {

compiler/testData/diagnostics/tests/functionLiterals/kt51317.fir.kt

@@ -0,0 +1,11 @@
+val f: (String.() -> String)? = null
+
+fun box(): String {
+    val g = when {
+        f != null -> f
+        else -> {
+            { this + "K" }
+        }
+    }
+    return g("O")
+}

compiler/testData/diagnostics/tests/functionLiterals/kt51317.kt

@@ -0,0 +1,11 @@
+val f: (String.() -> String)? = null
+
+fun box(): String {
+    val g = when {
+        f != null -> <!DEBUG_INFO_SMARTCAST!>f<!>
+        else -> {
+            { this + "K" }
+        }
+    }
+    return g("O")
+}

compiler/testData/diagnostics/tests/functionLiterals/kt51317.txt

@@ -0,0 +1,4 @@
+package
+
+public val f: (kotlin.String.() -> kotlin.String)? = null
+public fun box(): kotlin.String

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

@@ -11478,6 +11478,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                 runTest("compiler/testData/diagnostics/tests/functionLiterals/kt47493.kt");
             }
 
+            @Test
+            @TestMetadata("kt51317.kt")
+            public void testKt51317() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/functionLiterals/kt51317.kt");
+            }
+
             @Test
             @TestMetadata("kt6541_extensionForExtensionFunction.kt")
             public void testKt6541_extensionForExtensionFunction() throws Exception {

core/descriptors/src/org/jetbrains/kotlin/types/AnnotationsTypeAttribute.kt

@@ -10,9 +10,11 @@ import org.jetbrains.kotlin.descriptors.annotations.composeAnnotations
 import kotlin.reflect.KClass
 
 class AnnotationsTypeAttribute(val annotations: Annotations) : TypeAttribute<AnnotationsTypeAttribute>() {
-    override fun union(other: AnnotationsTypeAttribute?): AnnotationsTypeAttribute? = null
+    override fun union(other: AnnotationsTypeAttribute?): AnnotationsTypeAttribute? =
+        if (other == this) this else null
 
-    override fun intersect(other: AnnotationsTypeAttribute?): AnnotationsTypeAttribute? = null
+    override fun intersect(other: AnnotationsTypeAttribute?): AnnotationsTypeAttribute? =
+        if (other == this) this else null
 
     override fun add(other: AnnotationsTypeAttribute?): AnnotationsTypeAttribute {
         if (other == null) return this
@@ -23,6 +25,13 @@ class AnnotationsTypeAttribute(val annotations: Annotations) : TypeAttribute<Ann
 
     override val key: KClass<out AnnotationsTypeAttribute>
         get() = AnnotationsTypeAttribute::class
+
+    override fun equals(other: Any?): Boolean {
+        if (other !is AnnotationsTypeAttribute) return false
+        return other.annotations == this.annotations
+    }
+
+    override fun hashCode(): Int = annotations.hashCode()
 }
 
 val TypeAttributes.annotationsAttribute: AnnotationsTypeAttribute? by TypeAttributes.attributeAccessor<AnnotationsTypeAttribute>()