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Extract wildcard GADT constraints more directly #14832

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merged 2 commits into from
Apr 9, 2022
Merged

Extract wildcard GADT constraints more directly #14832

merged 2 commits into from
Apr 9, 2022

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dwijnand
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@dwijnand dwijnand commented Apr 3, 2022

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@dwijnand dwijnand marked this pull request as ready for review April 3, 2022 15:34
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dwijnand commented Apr 3, 2022

I'm not sure how paranoid to be about things. For instance, whether to still special case argP being a TypeBounds. Personally I would do it this way, to avoid the noise and allow for the discovery of cases that need handling. But I'm happy to add the if back, returning true.

abgruszecki
abgruszecki reviewed Apr 4, 2022
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The code change looks good, but I'm a bit worried about not having an additional test. Do we have tests both for argS and argP being TypeBounds?

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dwijnand commented Apr 4, 2022 •
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Well the test case from #14132 is still there, and exercises the argS side. For argP I'm not sure. Something like case _: Box[_ <: String] => isn't going to work anyways, but is it something that could cause a problem? I guess I could give it a try and see if I can see it add bad constraints.

@dwijnand dwijnand assigned dwijnand and unassigned abgruszecki Apr 4, 2022
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Add a test case there the pattern has a bound
9bc8c9b 
Looking at the log of constr, gadts, and gadtsConstr there seems to be
no change in behaviour compared to before the implementation change in
PatternTypeConstrainer.
@dwijnand dwijnand assigned abgruszecki and unassigned dwijnand Apr 7, 2022
@abgruszecki abgruszecki merged commit ebe3d54 into scala:main Apr 9, 2022
@dwijnand dwijnand deleted the extract-wildcard-gadt-constraints branch April 9, 2022 14:43
@Kordyjan Kordyjan added this to the 3.2.0 milestone Aug 1, 2023
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