Add unapply pattern completion test

Author: natsukagami

presentation-compiler/test/dotty/tools/pc/tests/completion/CompletionSuite.scala

@@ -634,14 +634,40 @@ class CompletionSuite extends BaseCompletionSuite:
          |""".stripMargin
     )
 
+  @Test def patRecursive =
+    check(
+      s"""|object Main {
+          |  Option(List(Option(1))) match {
+          |    case Some(List(None, Som@@))
+          |}
+          |""".stripMargin,
+      """|Some(value) scala
+         |Some[A](value: A): Some[A]
+         |Some scala
+         |""".stripMargin
+    )
+    check(
+      s"""|object Main {
+          |  Option(Option(1)) match {
+          |    case Some(Som@@)
+          |}
+          |""".stripMargin,
+      """|Some(value) scala
+         |Some[A](value: A): Some[A]
+         |Some scala
+         |""".stripMargin
+    )
+
   @Test def pat1 =
     check(
       s"""|object Main {
           |  Option(1) match {
           |    case List(Som@@)
           |}
           |""".stripMargin,
-      """|Some[A](value: A): Some[A]
+      """|Some(value) scala
+         |Some scala
+         |Some[A](value: A): Some[A]
          |Some scala
          |""".stripMargin
     )