From 92fa54136a777cad7f5ce64d918a581b8401c80f Mon Sep 17 00:00:00 2001
From: hellrich <hellrich.j@gmail.com>
Date: Sat, 11 Mar 2017 16:37:18 +0100
Subject: [PATCH 1/4] added printed output as comment

---
 src/main/scala/stdlib/PatternMatching.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/scala/stdlib/PatternMatching.scala b/src/main/scala/stdlib/PatternMatching.scala
index 5dbdeebb..d40d89fc 100644
--- a/src/main/scala/stdlib/PatternMatching.scala
+++ b/src/main/scala/stdlib/PatternMatching.scala
@@ -17,7 +17,7 @@ object PatternMatching extends FlatSpec with Matchers with org.scalaexercises.de
     * case 2 => "two"
     * case _ => "many"
     * }
-    * println(matchTest(3))
+    * println(matchTest(3)) // prints "many"
     * }
     * }}}
     *

From 86f821be51f2b6d322636fcf5ae4ff164dcac3ff Mon Sep 17 00:00:00 2001
From: hellrich <hellrich.j@gmail.com>
Date: Sat, 11 Mar 2017 16:39:43 +0100
Subject: [PATCH 2/4] additional comment, comment formatting

---
 src/main/scala/stdlib/PatternMatching.scala | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/main/scala/stdlib/PatternMatching.scala b/src/main/scala/stdlib/PatternMatching.scala
index d40d89fc..6509f9a1 100644
--- a/src/main/scala/stdlib/PatternMatching.scala
+++ b/src/main/scala/stdlib/PatternMatching.scala
@@ -15,7 +15,7 @@ object PatternMatching extends FlatSpec with Matchers with org.scalaexercises.de
     * def matchTest(x: Int): String = x match {
     * case 1 => "one"
     * case 2 => "two"
-    * case _ => "many"
+    * case _ => "many" // case _ will trigger if all other cases fail.
     * }
     * println(matchTest(3)) // prints "many"
     * }
@@ -38,7 +38,7 @@ object PatternMatching extends FlatSpec with Matchers with org.scalaexercises.de
         println("BLUE"); 2
       case "green" ⇒
         println("GREEN"); 3
-      case _ ⇒ println(stuff); 0 //case _ will trigger if all other cases fail.
+      case _ ⇒ println(stuff); 0 // case _ will trigger if all other cases fail.
     }
 
     myStuff should be(res0)

From 630466cf994fcd082101fc619fbdaedc8ba0769b Mon Sep 17 00:00:00 2001
From: hellrich <hellrich.j@gmail.com>
Date: Sat, 11 Mar 2017 17:31:21 +0100
Subject: [PATCH 3/4] additional comment

---
 src/main/scala/stdlib/PatternMatching.scala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/scala/stdlib/PatternMatching.scala b/src/main/scala/stdlib/PatternMatching.scala
index 6509f9a1..08cf2a3a 100644
--- a/src/main/scala/stdlib/PatternMatching.scala
+++ b/src/main/scala/stdlib/PatternMatching.scala
@@ -178,7 +178,7 @@ object PatternMatching extends FlatSpec with Matchers with org.scalaexercises.de
     */
   def againstListsIIIPatternMatching(res0: Int) {
     val secondElement = List(1) match {
-      case x :: y :: xs ⇒ y
+      case x :: y :: xs ⇒ y // only matches a list with two or more items
       case _            ⇒ 0
     }
 

From ec11b4125a6fe98666be488aaeb2026e20bdaf55 Mon Sep 17 00:00:00 2001
From: hellrich <hellrich.j@gmail.com>
Date: Sat, 11 Mar 2017 17:56:54 +0100
Subject: [PATCH 4/4] added another list example

---
 src/main/scala/stdlib/PatternMatching.scala     | 13 ++++++++++++-
 src/test/scala/stdlib/PatternMatchingSpec.scala | 10 ++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/main/scala/stdlib/PatternMatching.scala b/src/main/scala/stdlib/PatternMatching.scala
index 08cf2a3a..5b7ca27b 100644
--- a/src/main/scala/stdlib/PatternMatching.scala
+++ b/src/main/scala/stdlib/PatternMatching.scala
@@ -189,11 +189,22 @@ object PatternMatching extends FlatSpec with Matchers with org.scalaexercises.de
     */
   def againstListsIVPatternMatching(res0: Int) {
     val r = List(1, 2, 3) match {
-      case x :: y :: Nil ⇒ y
+      case x :: y :: Nil ⇒ y // only matches a list with exactly two items
       case _             ⇒ 0
     }
 
     r should be(res0)
   }
 
+  /** If a pattern is exactly one element longer than a `List`, it extracts the final `Nil`:
+    */
+  def againstListsVPatternMatching(res0: Boolean) {
+    val r = List(1, 2, 3) match {
+      case x :: y :: z :: tail ⇒ tail
+      case _             ⇒ 0
+    }
+
+    r == Nil should be(res0)
+  }
+
 }
diff --git a/src/test/scala/stdlib/PatternMatchingSpec.scala b/src/test/scala/stdlib/PatternMatchingSpec.scala
index 45f80431..3d880625 100644
--- a/src/test/scala/stdlib/PatternMatchingSpec.scala
+++ b/src/test/scala/stdlib/PatternMatchingSpec.scala
@@ -105,4 +105,14 @@ class PatternMatchingSpec extends Spec with Checkers {
       )
     )
   }
+
+  def `pattern matching lists part five` = {
+    check(
+      Test.testSuccess(
+        PatternMatching.againstListsVPatternMatching _,
+        true :: HNil
+      )
+    )
+  }
+
 }