3 files changed, 40 insertions, 0 deletions
diff --git a/test/files/neg/t2421b.check b/test/files/neg/t2421b.check
new file mode 100644
index 0000000000..f666a7d9d7
--- /dev/null
+++ b/test/files/neg/t2421b.check
@@ -0,0 +1,4 @@
+t2421b.scala:12: error: could not find implicit value for parameter aa: Test.F[Test.A]
+  f
+  ^
+one error found
+\ No newline at end of file
diff --git a/test/files/neg/t2421b.scala b/test/files/neg/t2421b.scala
new file mode 100644
index 0000000000..d8159a8c37
--- /dev/null
+++ b/test/files/neg/t2421b.scala
@@ -0,0 +1,17 @@
+object Test {
+  class A
+  class B
+  class C
+  class F[X]
+
+  def f(implicit aa: F[A]) = println(aa)
+
+  // implicit def a : F[A] = new F[A]()
+  implicit def b[X <: B] = new F[X]()
+
+  f
+}
+
+/* bug:
+error: type arguments [Test2.A] do not conform to method b's type parameter bounds [X <: Test2.B]
+*/
+\ No newline at end of file
diff --git a/test/files/pos/t2421b.scala b/test/files/pos/t2421b.scala
new file mode 100644
index 0000000000..0df3461662
--- /dev/null
+++ b/test/files/pos/t2421b.scala
@@ -0,0 +1,19 @@
+object Test {
+  class A
+  class B
+  class C
+  class F[X]
+
+  def f(implicit aa: F[A]) = println(aa)
+
+  implicit def a : F[A] = new F[A]()
+  implicit def b[X <: B] = new F[X]()
+
+  f
+}
+/* bug:
+error: ambiguous implicit values:
+ both method b in object Test1 of type [X <: Test1.B]Test1.F[X]
+ and method a in object Test1 of type => Test1.F[Test1.A]
+ match expected type Test1.F[Test1.A]
+*/