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trait A1
trait A2
trait A3
trait L1 extends A1 with A2 with A3
object Test {
trait T1[-A <: A1]
trait T2[-A >: L1]
trait T3[ A <: A1]
trait T4[ A >: L1]
trait T5[+A <: A1]
trait T6[+A >: L1]
def f1(x: T1[_]) = x
def f2(x: T2[_]) = x
def f3(x: T3[_]) = x
def f4(x: T4[_]) = x
def f5(x: T5[_]) = x
def f6(x: T6[_]) = x
// a.scala:22: error: type arguments [Any] do not conform to trait T5's type parameter bounds [+A <: A1]
// def f5(x: T5[_]) = x
// ^
def g1(x: T1[_ <: A1]) = x
def g2(x: T2[_ >: L1]) = x
def g3(x: T3[_ <: A1]) = x
def g4(x: T4[_ >: L1]) = x
def g5(x: T5[_ <: A1]) = x
def g6(x: T6[_ >: L1]) = x
def q1(x: T1[_ >: L1]) = x
def q2(x: T2[_ <: A1]) = x
def q3(x: T3[_ >: L1]) = x
def q4(x: T4[_ <: A1]) = x
def q5(x: T5[_ >: L1]) = x
def q6(x: T6[_ <: A1]) = x
// a.scala:41: error: type arguments [Any] do not conform to trait T5's type parameter bounds [+A <: A1]
// def q5(x: T5[_ >: L1]) = x
// ^
// two errors found
def h1(x: T1[_ >: L1 <: A1]) = x
def h2(x: T2[_ >: L1 <: A1]) = x
def h3(x: T3[_ >: L1 <: A1]) = x
def h4(x: T4[_ >: L1 <: A1]) = x
def h5(x: T5[_ >: L1 <: A1]) = x
def h6(x: T6[_ >: L1 <: A1]) = x
}
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