lean4-htt/tests/compiler/overflow3.lean
2021-09-28 17:46:19 -07:00

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def longArray (n : Nat := 50000) (xs : Array Char := #[]) : Array Char :=
match n with
| 0 => xs
| n+1 => longArray n (xs.push 'a')
def OverflowLoop
{m : Type -> Type}
[inst1: Monad m]
(xs: Array Char) :
StateT Nat m Nat := do
let mut out := 0
for c in xs do
match c with
| 'z' => panic "z"
| _ => out := out + 1
return out
def main : IO Unit :=
let x := (StateT.run (@OverflowLoop Id _ longArray) 0).fst
IO.println x