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Parameters on actions sometimes cause a crash #1621

mtzguido opened this Issue Jan 3, 2019 · 2 comments


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mtzguido commented Jan 3, 2019

let st (s:Type) (a:Type) = s -> M (a * s)
let return_st (s:Type) (a:Type) (x:a) : st s a = fun s0 -> x, s0

let bind_st (s:Type) (a:Type) (b:Type) (f:st s a) (g:a -> st s b) : st s b
  = fun (s0:s) -> let (x,s) = f s0 in g x s

(* Actions *)
let get (s:Type) () : st s s = fun s0 -> s0, s0

total reifiable reflectable new_effect {
  STATE_h (s:Type0) : a:Type -> Effect
  with repr     = st s
     ; bind     = bind_st s
     ; return   = return_st s
     ; get (i:int) = get s

new_effect STATE_int = STATE_h int


Unexpected error; please file a bug report, ideally with a minimized version of the source program that triggered the error.
Failure("Impossible: Violation of locally nameless convention: s@1:(Tm_unknown)")

Without defining STATE_int, there is no crash, but after checking the type of get it seems the i : int parameter is somehow lost. Nevermind, I was checking get instead of STATE_h?.get.

Possibly related: #885 and #714


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catalin-hritcu commented Jan 10, 2019

mtzguido added a commit that referenced this issue Jan 10, 2019


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mtzguido commented Jan 10, 2019

I got a fix for this.

@mtzguido mtzguido closed this in e138156 Jan 10, 2019

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