Draft Spec for Third Preview of Pattern Matching for Switch and Record Patterns (JEP 405) now available

[Gavin Bierman]

Thanks Guy.

All corrected.

Gavin

On 8 Apr 2022, at 03:27, Guy Steele <guy.steele at oracle.com<mailto:guy.steele at oracle.com>> wrote:


13.4.26 Evolution of Enum Classes

Adding or reordering enum constants in an enum class will not break compatibility with pre-existing binaries.

As with sealed classes (13.4.2.1<http://cr.openjdk.java.net/~gbierman/PatternSwitchPlusRecordPatterns/PatternSwitchPlusRecordPatterns-20220407/specs/patterns-switch-jls.html#jls-13.4.2.1>), whilst adding an enum constant to an enum class is considered a binary compatible change, it may cause the execution of an exhaustive switch (14.11.1<http://cr.openjdk.java.net/~gbierman/PatternSwitchPlusRecordPatterns/PatternSwitchPlusRecordPatterns-20220407/specs/patterns-switch-jls.html#jls-14.11.1>) to fail with a linkage error (an IncompatibleClassChangeError may be thrown) if the switch encounters the new enum constant that was not known at compile time (14.11.3<http://cr.openjdk.java.net/~gbierman/PatternSwitchPlusRecordPatterns/PatternSwitchPlusRecordPatterns-20220407/specs/patterns-switch-jls.html#jls-14.11.3>, 15.28.2<http://cr.openjdk.java.net/~gbierman/PatternSwitchPlusRecordPatterns/PatternSwitchPlusRecordPatterns-20220407/specs/patterns-switch-jls.html#jls-15.28.2>).


Would it be more accurate (or more to the point) to replace “whilst” with “although”?

—Guy


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