On Tue, 12 Apr 2022 13:18:14 GMT, Jan Lahoda <jlah...@openjdk.org> wrote:
>> This is a (preliminary) patch for javac implementation for the third preview >> of pattern matching for switch (type patterns in switches). >> >> Draft JLS: >> http://cr.openjdk.java.net/~gbierman/PatternSwitchPlusRecordPatterns/PatternSwitchPlusRecordPatterns-20220407/specs/patterns-switch-jls.html >> >> The changes are: >> -there are no guarded patterns anymore, guards are not bound to the >> CaseElement (JLS 15.28) >> -a new contextual keyword `when` is used to add a guard, instead of `&&` >> -`null` selector value is handled on switch level (if a switch has `case >> null`, it is used, otherwise a NPE is thrown), rather than on pattern >> matching level. >> -total patterns are allowed in `instanceof` >> -`java.lang.MatchException` is added for the case where a switch is >> exhaustive (due to sealed types) at compile-time, but not at runtime. >> >> Feedback is welcome! >> >> Thanks! > > Jan Lahoda has updated the pull request incrementally with one additional > commit since the last revision: > > Cleanup. `java.lang.MatchException` should probably also be thrown by non‑`enum` enhanced `switch` statements[^1], to match non‑`enum` `switch` expressions[^2]. [^1]: https://cr.openjdk.java.net/~gbierman/PatternSwitchPlusRecordPatterns/PatternSwitchPlusRecordPatterns-20220407/specs/patterns-switch-jls.html#jls-14.11.3 [^2]: https://cr.openjdk.java.net/~gbierman/PatternSwitchPlusRecordPatterns/PatternSwitchPlusRecordPatterns-20220407/specs/patterns-switch-jls.html#jls-15.28.2 ------------- PR: https://git.openjdk.java.net/jdk/pull/8182
