Sealed classes: extra java against kotlin tests, together with an implementation of Java diagnostics inside these tests

compiler/testData/compileJavaAgainstKotlin/sealed/Derived.java

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+package test;
+
+// It's not possible to inherit from Season (it's sealed in Kotlin)
+public class Derived extends Season {
+
+}

compiler/testData/compileJavaAgainstKotlin/sealed/Derived.javaerr.txt

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+Derived.java:4:8:compiler.err.report.access

compiler/testData/compileJavaAgainstKotlin/sealed/Derived.kt

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+package test
+
+public sealed class Season {
+    class Warm: Season()
+    class Cold: Season()
+}

compiler/testData/compileJavaAgainstKotlin/sealed/Derived.txt

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+package test
+
+public sealed class Season {
+    private constructor Season()
+
+    internal final class Cold : test.Season {
+        public constructor Cold()
+    }
+
+    internal final class Warm : test.Season {
+        public constructor Warm()
+    }
+}

compiler/testData/compileJavaAgainstKotlin/sealed/Instance.java

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+package test;
+
+public class Instance {
+    // It is not possible to create Season instance (it's sealed in Kotlin)
+    static Season create() {
+        return new Season();
+    }
+}

compiler/testData/compileJavaAgainstKotlin/sealed/Instance.javaerr.txt

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+Instance.java:6:16:compiler.err.abstract.cant.be.instantiated

compiler/testData/compileJavaAgainstKotlin/sealed/Instance.kt

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+package test
+
+public sealed class Season {
+    class Warm: Season()
+    class Cold: Season()
+}

compiler/testData/compileJavaAgainstKotlin/sealed/Instance.txt

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+package test
+
+public sealed class Season {
+    private constructor Season()
+
+    internal final class Cold : test.Season {
+        public constructor Cold()
+    }
+
+    internal final class Warm : test.Season {
+        public constructor Warm()
+    }
+}