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Record ordering constraint between HK type variables #9733

Merged
merged 1 commit into from
Sep 18, 2020
Merged

Record ordering constraint between HK type variables #9733

merged 1 commit into from
Sep 18, 2020

Commits on Sep 18, 2020

  1. Record ordering constraint between HK type variables 

    If `?F <: [X] => ?G[X]`, then the ordering part of the constraint should
record `?F <: ?G`, otherwise constraints won't be propagated correctly.

It's not clear to me if we should make a similar change in `stripParams`
but note that doing so would require being a bit careful: since we use
the upper bound of a type variable to determine its kind, we can't just
replace it by `[X] => ?G[X]` by `AnyKind`.

Fixes scala#9676.
    @smarter
    smarter committed Sep 18, 2020
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