Add tests for obsolete issues

#KT-38804 Obsolete
 #KT-38801 Obsolete
 #KT-38835 Obsolete
 #KT-38737 Obsolete
 #KT-38664 Obsolete
 #KT-38549 Obsolete
 #KT-38766 Obsolete
 #KT-38714 Obsolete

compiler/testData/diagnostics/testsWithStdLib/inference/kt38737.kt

@@ -0,0 +1,13 @@
+private const val dateRangeStart: String = "2020-01-01"
+private const val dateRangeEnd: String = "2020-05-01"
+
+private fun String?.toIconList(): List<String> = when (this) {
+    null -> listOf("DATE_IS_NULL")
+    in dateRangeStart..dateRangeEnd -> emptyList()
+    else -> listOf("DATE_IS_OUT_OF_RANGE")
+}
+
+fun main() {
+    println("2019-12-31".toIconList())
+    println(null.toIconList())
+}