stream_x_is_cons_x_tail_x.err

--- opening "stream_x_is_cons_x_tail_x.ma" ---
--- scope checking ---
--- type checking ---
type  Nat : Set
term  Nat.zero : < Nat.zero : Nat >
term  Nat.succ : ^(y0 : Nat) -> < Nat.succ y0 : Nat >
term  n0 : Nat
term  n0 = Nat.zero
term  n1 : Nat
term  n1 = Nat.succ n0
term  n2 : Nat
term  n2 = Nat.succ n1
term  n3 : Nat
term  n3 = Nat.succ n2
term  n4 : Nat
term  n4 = Nat.succ n3
type  Stream : ++(A : Set) -> - Size -> Set
term  Stream.cons : .[A : Set] -> .[i : Size] -> ^(y1 : A) -> ^(y2 : Stream A i) -> < Stream.cons i y1 y2 : Stream A $i >
term  tail : .[A : Set] -> .[i : Size] -> Stream A $i -> Stream A i
{ tail [A] [i] (Stream.cons [.i] x xs) = xs
}
term  bad : .[i : Size] -> Stream Nat i
error during typechecking:
bad
/// clause 1
/// pattern $$i
/// cannot match against deep successor pattern $$i at type .[i : Size] -> Stream Nat i