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Add an irrefutable version of the NoSuccess extractor #496

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merged 1 commit into from
Jan 25, 2023
Merged

Add an irrefutable version of the NoSuccess extractor #496

merged 1 commit into from
Jan 25, 2023

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lrytz
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@lrytz lrytz commented Jan 17, 2023

NoSuccess.unapply cannot be changed due to binary compatibility.

@lrytz lrytz changed the title Add an exhaustive version of the NoSuccess extractor Add an irrefutable version of the NoSuccess extractor Jan 17, 2023
@lrytz lrytz requested a review from dwijnand January 17, 2023 10:56
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lrytz commented Jan 17, 2023

Binary compatibility checks fail because of the new definition, I assume if this goes to a version 2.2.x it should be fine?

@SethTisue SethTisue self-assigned this Jan 19, 2023
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I assume if this goes to a version 2.2.x it should be fine

We currently have versionPolicyIntention set to backwards-compat-only BinaryCompatible (rather than to the stricter BinaryAndSourceCompatible for bidirectional compat), so I think we need to take seriously the possibility that MiMa is right to reject the change.

The failure looks like:

[error]  * abstract method NoSuccessE()scala.util.parsing.combinator.Parsers#NoSuccessE# in interface scala.util.parsing.combinator.Parsers is present only in current version
[error]    filter with: ProblemFilters.exclude[ReversedMissingMethodProblem]("scala.util.parsing.combinator.Parsers.NoSuccessE")

If I understand ReversedMissingMethodProblem correctly, it's complaining because a method was added to an interface. Doing so isn't backwards binary compatible because existing classes that implement that interface will lack an implementation for the new method.

Must the new extractor be nested inside Parsers?

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lrytz commented Jan 23, 2023

Thanks Seth, I failed to challenge my assumptions...

Added a nested extractor case NoSuccess.I(msg, next), that has better ergonomics as well. Should NoSuccess.unapply be deprecated to help people find the new one?

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Um, hmm, judgment call... I'm a bit tempted to say just Scaladoc it rather than deprecate, but really, I'm on the fence. @Philippus opinion?

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The exhaustivity already functions as a heads up. So doc it, I agree.

@SethTisue SethTisue assigned lrytz and unassigned SethTisue Jan 24, 2023
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Add an irrefutable version of the NoSuccess extractor
cb53ee1 
NoSuccess.unapply cannot be changed due to binary compatibility.
@SethTisue SethTisue merged commit 537211c into scala:main Jan 25, 2023
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@lrytz shall I roll a release?

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lrytz commented Jan 26, 2023

Yes thanks!

@SethTisue SethTisue mentioned this pull request Jan 26, 2023
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@LuciferYang LuciferYang mentioned this pull request Feb 20, 2023
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srowen pushed a commit to apache/spark that referenced this pull request Feb 20, 2023
@LuciferYang @srowen
[SPARK-42489][BUILD] Upgrdae scala-parser-combinators from 2.1.1 to 2…
09d1e94 
….2.0

### What changes were proposed in this pull request?
This pr aims upgrade `scala-parser-combinators from` from 2.1.1 to 2.2.0.

### Why are the changes needed?
scala/scala-parser-combinators#496 add `NoSuccess.I` to helps users avoid exhaustiveness warnings in their pattern matches, especially on Scala 2.13 and 3. The full release note as follows:
- https://github.com/scala/scala-parser-combinators/releases/tag/v2.2.0

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
Pass GitHub Actions

Closes #40083 from LuciferYang/SPARK-42489.

Authored-by: yangjie01 <yangjie01@baidu.com>
Signed-off-by: Sean Owen <srowen@gmail.com>
peteraldous pushed a commit to peteraldous/scala-parser-combinators that referenced this pull request Mar 6, 2023
@lrytz @professoraldous
Add an irrefutable version of the NoSuccess extractor (scala#496)
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