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fix insidious bug in CCList.flat_map

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we have been accidentally relying on evaluation order.
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Simon Cruanes 2023-12-15 22:36:39 -05:00
parent 7436727942
commit c4dcf1efe2
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GPG key ID: EBFFF6F283F3A2B4
1 changed files with 6 additions and 2 deletions
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8
src/core/CCList.ml
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@ -372,16 +372,20 @@ let[@inline] flat_map f l =
match l with
| [] -> []
| [ x ] -> f x
| x :: tl -> flat_map_kont f l Fun.id
| _ :: _ -> flat_map_kont f l Fun.id
[@@@else_]
(* let flat_map = concat_map *)
let flat_map f l =
let rec direct i f l =
match l with
| [] -> []
| [ x ] -> f x
| [ x; y ] -> append (f x) (f y)
| [ x; y ] ->
let x = f x in
let y = f y in
append x y
| _ when i = 0 -> flat_map_kont f l Fun.id
| x :: y :: tl ->
let x = f x in