Extending trait with context bounds requires unnecessary parenthesis

[typeness]

Given:

trait T[A: Numeric]
class TX[A: Numeric] extends T[A]

compiler yields:

class TX[A: Numeric] extends T[A]
                             ^^^^
                      constructor T in trait T does not take parameters

It works if you do extends T[A]()

[allanrenucci]

Note that no error is reported if T is a class