Merge pull request #4711 from janrock-ylb/master

Fix #4674: Add regression test

Author: allanrenucci

tests/neg-custom-args/fatal-warnings/i4674.scala

@@ -0,0 +1,8 @@
+class Test {
+  def test(x: String) = {
+    x.foreach {
+      case 's' => println("s")
+      case c: Char => println(c) // error: type test always succeeds
+    }
+  }
+}