Backport "fix(#15784): ident rule for pat match was too strict" to LTS #20848
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
close #15784 Scala 2 allows backticked identifier and capital identifier in pattern match, but Scala 3 mistakenly prohibited them. For example, the following code is valid in Scala 2, ```scala List(42) match { case List(_, Rest @ _*) => Rest case List(_, `Rest` @ _*) => `Rest` _ => ??? } ``` whereas it resulted in `Not Found Rest` error in Scala 3. This is because the condition to detect wildcard pattern was so strict that it chose the wrong match arm; `case _ => ifExpr`. [Cherry-picked e236cdd]
[Cherry-picked 09abbd6]
|
No regressions detected in the community build up to lts-19520. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Backports #19501 to the LTS branch.
PR submitted by the release tooling.
[skip ci]