4 files changed, 65 insertions, 1 deletions
diff --git a/test/files/neg/warn-unused-imports/warn-unused-imports_2.scala b/test/files/neg/warn-unused-imports/warn-unused-imports_2.scala
index ded1186209..56ad3393a1 100644
--- a/test/files/neg/warn-unused-imports/warn-unused-imports_2.scala
+++ b/test/files/neg/warn-unused-imports/warn-unused-imports_2.scala
@@ -96,7 +96,7 @@ trait Warn {
 trait Nested {
   {
     import p1._   // warn
-    trait Warn {  // warn about unused local trait for good measure
+    trait Warn {  // don't warn about unused local trait with -Ywarn-unused:imports
       import p2._
       println(new A)
       println("abc".bippy)
diff --git a/test/files/neg/warn-unused-patvars.check b/test/files/neg/warn-unused-patvars.check
new file mode 100644
index 0000000000..002f7a07ca
--- /dev/null
+++ b/test/files/neg/warn-unused-patvars.check
@@ -0,0 +1,12 @@
+warn-unused-patvars.scala:7: warning: private val x in trait Boundings is never used
+  private val x = 42                      // warn, sanity check
+              ^
+warn-unused-patvars.scala:26: warning: local val x in method v is never used
+    val D(x) = d                          // warn, fixme
+         ^
+warn-unused-patvars.scala:30: warning: local val x in method w is never used
+    val D(x @ _) = d                      // warn, fixme (valdef pos is different)
+         ^
+error: No warnings can be incurred under -Xfatal-warnings.
+three warnings found
+one error found
diff --git a/test/files/neg/warn-unused-patvars.flags b/test/files/neg/warn-unused-patvars.flags
new file mode 100644
index 0000000000..d5bd86a658
--- /dev/null
+++ b/test/files/neg/warn-unused-patvars.flags
@@ -0,0 +1 @@
+-Ywarn-unused:-patvars,_ -Xfatal-warnings
diff --git a/test/files/neg/warn-unused-patvars.scala b/test/files/neg/warn-unused-patvars.scala
new file mode 100644
index 0000000000..6f4620c0c7
--- /dev/null
+++ b/test/files/neg/warn-unused-patvars.scala
@@ -0,0 +1,51 @@
+
+case class C(a: Int, b: String, c: Option[String])
+case class D(a: Int)
+
+trait Boundings {
+
+  private val x = 42                      // warn, sanity check
+
+  def c = C(42, "hello", Some("world"))
+  def d = D(42)
+
+  def f() = {
+    val C(x, y, Some(z)) = c              // no warn
+    17
+  }
+  def g() = {
+    val C(x @ _, y @ _, Some(z @ _)) = c  // no warn
+    17
+  }
+  def h() = {
+    val C(x @ _, y @ _, z @ Some(_)) = c  // no warn for z?
+    17
+  }
+
+  def v() = {
+    val D(x) = d                          // warn, fixme
+    17
+  }
+  def w() = {
+    val D(x @ _) = d                      // warn, fixme (valdef pos is different)
+    17
+  }
+
+}
+
+trait Forever {
+  def f = {
+    val t = Option((17, 42))
+    for {
+      ns <- t
+      (i, j) = ns                        // no warn
+    } yield (i + j)
+  }
+  def g = {
+    val t = Option((17, 42))
+    for {
+      ns <- t
+      (i, j) = ns                        // no warn
+    } yield 42
+  }
+}