patmat-type-check.scala:11: warning: fruitless type test: a value of type Test.Bop4[T] cannot also be a Seq[A]
  def s3[T](x: Bop4[T]) = x match { case Seq('b', 'o', 'b') => true }
                                            ^
patmat-type-check.scala:11: error: pattern type is incompatible with expected type;
 found   : Seq[A]
 required: Test.Bop4[T]
  def s3[T](x: Bop4[T]) = x match { case Seq('b', 'o', 'b') => true }
                                            ^
patmat-type-check.scala:15: warning: fruitless type test: a value of type Test.Bop5[_$1,T1,T2] cannot also be a Seq[A]
  def s4[T1, T2](x: Bop5[_, T1, T2]) = x match { case Seq('b', 'o', 'b') => true }
                                                         ^
patmat-type-check.scala:15: error: pattern type is incompatible with expected type;
 found   : Seq[A]
 required: Test.Bop5[_$1,T1,T2] where type _$1
  def s4[T1, T2](x: Bop5[_, T1, T2]) = x match { case Seq('b', 'o', 'b') => true }
                                                         ^
patmat-type-check.scala:19: warning: fruitless type test: a value of type Test.Bop3[T] cannot also be a Seq[A]
  def f4[T](x: Bop3[T]) = x match { case Seq('b', 'o', 'b') => true }
                                            ^
patmat-type-check.scala:19: error: pattern type is incompatible with expected type;
 found   : Seq[A]
 required: Test.Bop3[T]
  def f4[T](x: Bop3[T]) = x match { case Seq('b', 'o', 'b') => true }
                                            ^
patmat-type-check.scala:22: error: scrutinee is incompatible with pattern type;
 found   : Seq[A]
 required: String
  def f1 = "bob".reverse match { case Seq('b', 'o', 'b') => true } // fail
                                         ^
patmat-type-check.scala:23: error: scrutinee is incompatible with pattern type;
 found   : Seq[A]
 required: Array[Char]
  def f2 = "bob".toArray match { case Seq('b', 'o', 'b') => true } // fail
                                         ^
patmat-type-check.scala:27: error: scrutinee is incompatible with pattern type;
 found   : Seq[A]
 required: Test.Bop2
  def f3(x: Bop2) = x match { case Seq('b', 'o', 'b') => true } // fail
                                      ^
patmat-type-check.scala:30: error: scrutinee is incompatible with pattern type;
 found   : Seq[A]
 required: Test.Bop3[Char]
  def f4[T](x: Bop3[Char]) = x match { case Seq('b', 'o', 'b') => true } // fail
                                               ^
three warnings found
7 errors found