trait-decreases.dfy(11,2): Error: method's (possibly automatically generated) decreases clause must be below or equal to that in the trait
 Asserted expression: (x, y nonincreases to y, x)
trait-decreases.dfy(13,2): Error: method's (possibly automatically generated) decreases clause must be below or equal to that in the trait
 Asserted expression: (y, x nonincreases to y)
trait-decreases.dfy(15,2): Error: method's (possibly automatically generated) decreases clause must be below or equal to that in the trait
 Asserted expression: (false, x nonincreases to y, x)

Dafny program verifier finished with 0 verified, 3 errors
