[FE] Prohibit inheritance of sealed classes in different module

KT-20423

compiler/testData/compileKotlinAgainstCustomBinaries/sealedInheritorInDifferentModule/library/base.kt

@@ -0,0 +1,7 @@
+package a
+
+sealed class Base
+
+sealed interface IBase
+
+class A : Base(), IBase

compiler/testData/compileKotlinAgainstCustomBinaries/sealedInheritorInDifferentModule/main.kt

@@ -0,0 +1,5 @@
+// ISSUE: KT-20423
+
+package a
+
+class B : Base(), IBase

compiler/testData/compileKotlinAgainstCustomBinaries/sealedInheritorInDifferentModule/output.txt

@@ -0,0 +1,20 @@
+warning: ATTENTION!
+This build uses unsafe internal compiler arguments:
+
+-XXLanguage:+FreedomForSealedClasses
+-XXLanguage:+SealedInterfaces
+
+This mode is not recommended for production use,
+as no stability/compatibility guarantees are given on
+compiler or generated code. Use it at your own risk!
+
+compiler/testData/compileKotlinAgainstCustomBinaries/sealedInheritorInDifferentModule/main.kt:5:11: error: cannot access '<init>': it is internal in 'Base'
+class B : Base(), IBase
+          ^
+compiler/testData/compileKotlinAgainstCustomBinaries/sealedInheritorInDifferentModule/main.kt:5:11: error: inheritance of sealed classes or interfaces from different module is prohibited
+class B : Base(), IBase
+          ^
+compiler/testData/compileKotlinAgainstCustomBinaries/sealedInheritorInDifferentModule/main.kt:5:19: error: inheritance of sealed classes or interfaces from different module is prohibited
+class B : Base(), IBase
+                  ^
+COMPILATION_ERROR

compiler/testData/diagnostics/tests/sealed/inheritorInDifferentModule.fir.kt

@@ -0,0 +1,17 @@
+// ISSUE: KT-20423
+// !LANGUAGE: +SealedInterfaces +FreedomForSealedClasses
+
+// MODULE: m1
+// FILE: a.kt
+package a
+
+sealed class Base
+
+class A : Base()
+
+// MODULE: m2(m1)
+// FILE: b.kt
+
+package a
+
+class B : <!HIDDEN!>Base<!>()

compiler/testData/diagnostics/tests/sealed/inheritorInDifferentModule.kt

@@ -0,0 +1,17 @@
+// ISSUE: KT-20423
+// !LANGUAGE: +SealedInterfaces +FreedomForSealedClasses
+
+// MODULE: m1
+// FILE: a.kt
+package a
+
+sealed class Base
+
+class A : Base()
+
+// MODULE: m2(m1)
+// FILE: b.kt
+
+package a
+
+class B : <!INVISIBLE_MEMBER, SEALED_INHERITOR_IN_DIFFERENT_MODULE!>Base<!>()

compiler/testData/diagnostics/tests/sealed/inheritorInDifferentModule.txt

@@ -0,0 +1,33 @@
+// -- Module: <m1> --
+package
+
+package a {
+
+    public final class A : a.Base {
+        public constructor A()
+        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 sealed class Base {
+        internal constructor Base()
+        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
+    }
+}
+
+
+// -- Module: <m2> --
+package
+
+package a {
+
+    public final class B : a.Base {
+        public constructor B()
+        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/testData/diagnostics/tests/sealed/interfaces/inheritorInDifferentModule.fir.kt

@@ -0,0 +1,17 @@
+// ISSUE: KT-20423
+// !LANGUAGE: +SealedInterfaces +FreedomForSealedClasses
+
+// MODULE: m1
+// FILE: a.kt
+package a
+
+sealed interface Base
+
+interface A : Base
+
+// MODULE: m2(m1)
+// FILE: b.kt
+
+package a
+
+interface B : Base

compiler/testData/diagnostics/tests/sealed/interfaces/inheritorInDifferentModule.kt

@@ -0,0 +1,17 @@
+// ISSUE: KT-20423
+// !LANGUAGE: +SealedInterfaces +FreedomForSealedClasses
+
+// MODULE: m1
+// FILE: a.kt
+package a
+
+sealed interface Base
+
+interface A : Base
+
+// MODULE: m2(m1)
+// FILE: b.kt
+
+package a
+
+interface B : <!SEALED_INHERITOR_IN_DIFFERENT_MODULE!>Base<!>

compiler/testData/diagnostics/tests/sealed/interfaces/inheritorInDifferentModule.txt

@@ -0,0 +1,30 @@
+// -- Module: <m1> --
+package
+
+package a {
+
+    public interface A : a.Base {
+        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 sealed interface Base {
+        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
+    }
+}
+
+
+// -- Module: <m2> --
+package
+
+package a {
+
+    public interface B : a.Base {
+        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
+    }
+}