Compiler warning on identical enum constant / is type entries #KT-4829 Fixed

compiler/testData/diagnostics/tests/when/DuplicatedLabels.kt

@@ -0,0 +1,51 @@
+package test
+
+const val four = 4
+
+fun first(arg: Int) = when (arg) {
+    1 -> 2
+    2 -> 3
+    <!DUPLICATE_LABEL_IN_WHEN!>1<!> -> 4
+    4 -> 5
+    <!DUPLICATE_LABEL_IN_WHEN!>1<!> -> 6
+    <!DUPLICATE_LABEL_IN_WHEN!>2<!> -> 7
+    // Error should be here: see KT-11971
+    four -> 8
+    else -> 0
+}
+
+fun second(arg: String): Int {
+    when (arg) {
+        "ABC" -> return 0
+        "DEF" -> return 1
+        <!DUPLICATE_LABEL_IN_WHEN!>"ABC"<!> -> return -1
+        <!DUPLICATE_LABEL_IN_WHEN!>"DEF"<!> -> return -2
+    }
+    return 42
+}
+
+fun third(arg: Any?): Int {
+    when (arg) {
+        null -> return -1
+        is String -> return 0
+        is Double -> return 1
+        is <!DUPLICATE_LABEL_IN_WHEN!>Double<!> -> return 2
+        <!DUPLICATE_LABEL_IN_WHEN!>null<!> -> return 3
+        else -> return 5
+    }
+}
+
+enum class Color { RED, GREEN, BLUE }
+
+fun fourth(arg: Color) = when (arg) {
+    Color.RED -> "RED"
+    Color.GREEN -> "GREEN"
+    <!DUPLICATE_LABEL_IN_WHEN!>Color.RED<!> -> "BLUE"
+    Color.BLUE -> "BLUE"
+}
+
+fun fifth(arg: Any?) = when (arg) {
+    is Any -> "Any"
+    <!ELSE_MISPLACED_IN_WHEN!>else<!> -> ""
+    <!UNREACHABLE_CODE!>else -> null<!>
+}

compiler/testData/diagnostics/tests/when/DuplicatedLabels.txt

@@ -0,0 +1,31 @@
+package
+
+package test {
+    public const val four: kotlin.Int = 4
+    public fun fifth(/*0*/ arg: kotlin.Any?): kotlin.String?
+    public fun first(/*0*/ arg: kotlin.Int): kotlin.Int
+    public fun fourth(/*0*/ arg: test.Color): kotlin.String
+    public fun second(/*0*/ arg: kotlin.String): kotlin.Int
+    public fun third(/*0*/ arg: kotlin.Any?): kotlin.Int
+
+    public final enum class Color : kotlin.Enum<test.Color> {
+        enum entry RED
+
+        enum entry GREEN
+
+        enum entry BLUE
+
+        private constructor Color()
+        public final override /*1*/ /*fake_override*/ val name: kotlin.String
+        public final override /*1*/ /*fake_override*/ val ordinal: kotlin.Int
+        protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
+        public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: test.Color): kotlin.Int
+        public final override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public final override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+        // Static members
+        public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): test.Color
+        public final /*synthesized*/ fun values(): kotlin.Array<test.Color>
+    }
+}