[FE 1.0] Report DUPLICATE_LABEL_IN_WHEN on proper branches

^KT-50385 Fixed

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

@@ -40,8 +40,8 @@ fun test() {
   val s = "";
 
   when (x) {
-    <!INCOMPATIBLE_TYPES!>s<!> -> 1
-    <!DUPLICATE_LABEL_IN_WHEN, INCOMPATIBLE_TYPES!>""<!> -> 1
+    <!DUPLICATE_LABEL_IN_WHEN, INCOMPATIBLE_TYPES!>s<!> -> 1
+    <!INCOMPATIBLE_TYPES!>""<!> -> 1
     x -> 1
     1 -> 1
   }

compiler/testData/diagnostics/tests/when/exhaustiveWhenWithConstVal.fir.kt

@@ -0,0 +1,45 @@
+// ISSUE: KT-50385
+
+const val myF = false
+const val myT = true
+
+fun test_1(someBoolean: Boolean) {
+    val s = when (someBoolean) {
+        myT /* true */ -> 1
+        myF /* false */ -> 2
+        true -> 3
+        false -> 4
+    }
+}
+
+fun test_2(someBoolean: Boolean) {
+    val s = when (someBoolean) {
+        myT /* true */ -> 1
+        true -> 2
+        false -> 3
+    }
+}
+
+fun test_3(someBoolean: Boolean) {
+    val s = <!NO_ELSE_IN_WHEN!>when<!> (someBoolean) {
+        myT /* true */ -> 1
+        false -> 2
+    }
+}
+
+fun test_4(someBoolean: Boolean) {
+    val s = <!NO_ELSE_IN_WHEN!>when<!> (someBoolean) {
+        myT /* true */ -> 1
+        myT /* true */ -> 2
+        false -> 3
+    }
+}
+
+fun test_5(someBoolean: Boolean) {
+    val s = <!NO_ELSE_IN_WHEN!>when<!> (someBoolean) {
+        myT /* true */ -> 1
+        myT /* true */ -> 2
+        myT /* true */ -> 3
+        false -> 4
+    }
+}

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

@@ -0,0 +1,46 @@
+// ISSUE: KT-50385
+
+const val myF = false
+const val myT = true
+
+fun test_1(someBoolean: Boolean) {
+    val s = when (someBoolean) {
+        <!DUPLICATE_LABEL_IN_WHEN!>myT<!> /* true */ -> 1
+        <!DUPLICATE_LABEL_IN_WHEN!>myF<!> /* false */ -> 2
+        true -> 3
+        false -> 4
+    }
+}
+
+fun test_2(someBoolean: Boolean) {
+    val s = when (someBoolean) {
+        <!DUPLICATE_LABEL_IN_WHEN!>myT<!> /* true */ -> 1
+        true -> 2
+        false -> 3
+    }
+}
+
+fun test_3(someBoolean: Boolean) {
+    val s = <!NO_ELSE_IN_WHEN!>when<!> (someBoolean) {
+        myT /* true */ -> 1
+        false -> 2
+    }
+}
+
+fun test_4(someBoolean: Boolean) {
+    val s = <!NO_ELSE_IN_WHEN!>when<!> (someBoolean) {
+        myT /* true */ -> 1
+        <!DUPLICATE_LABEL_IN_WHEN!>myT<!> /* true */ -> 2
+        false -> 3
+    }
+}
+
+fun test_5(someBoolean: Boolean) {
+    val s = <!NO_ELSE_IN_WHEN!>when<!> (someBoolean) {
+        myT /* true */ -> 1
+        <!DUPLICATE_LABEL_IN_WHEN!>myT<!> /* true */ -> 2
+        <!DUPLICATE_LABEL_IN_WHEN!>myT<!> /* true */ -> 3
+        false -> 4
+    }
+}
+

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

@@ -0,0 +1,10 @@
+package
+
+public const val myF: kotlin.Boolean = false
+public const val myT: kotlin.Boolean = true
+public fun test_1(/*0*/ someBoolean: kotlin.Boolean): kotlin.Unit
+public fun test_2(/*0*/ someBoolean: kotlin.Boolean): kotlin.Unit
+public fun test_3(/*0*/ someBoolean: kotlin.Boolean): kotlin.Unit
+public fun test_4(/*0*/ someBoolean: kotlin.Boolean): kotlin.Unit
+public fun test_5(/*0*/ someBoolean: kotlin.Boolean): kotlin.Unit
+