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Noticeable slowdown when typechecking abilities lists #5707

@etorreborre

Description

@etorreborre

Hi, I think there's some quadratic behavior in abilities lists.

Here is an example reproducing the issue:

type Abilities w = Abilities ({w} ())

type Options ts
    = { as : Abilities ts }

Options.empty = Options (Abilities ())

addValue : Abilities get -> Options {gets}  -> Options {gets, get}
addValue _t = cases Options _as -> Options (Abilities ())

ability T1 where get: ()

t1 : Abilities  {T1}
t1 = Abilities ()

test =
  Options.empty
    |> addValue t1
    |> addValue t1
    |> addValue t1
    |> addValue t1
    ... 

If you add more lines like addValue t1 you will notice that typechecking takes more and more time to complete.

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