[jdk17] Integrated: 8268320: Better error recovery for broken patterns in switch

[Jan Lahoda]

On Fri, 25 Jun 2021 12:58:59 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

> [a copy of https://github.com/openjdk/jdk/pull/4441 for JDK 17]
> 
> Trying to improve error recovery in case the user wanted to use a type-pattern in the switch construct, but didn't put a binding variable name after the type name. E.g.:
> 
> $ cat test/langtools/tools/javac/diags/examples/PatternExpected.java
> [snip]
> class PatternSwitch {
>     private void doSwitch(Object o) {
>         switch (o) {
>             case String: break;
>             default: break;
>         }
>     }
> }
> $ javac --enable-preview -source 17  test/langtools/tools/javac/diags/examples/PatternExpected.java
> test/langtools/tools/javac/diags/examples/PatternExpected.java:32: error: type pattern expected
>             case String: break;
>                  ^
> Note: test/langtools/tools/javac/diags/examples/PatternExpected.java uses preview features of Java SE 17.
> Note: Recompile with -Xlint:preview for details.
> 1 error

This pull request has now been integrated.

Changeset: 4ee400ae
Author:    Jan Lahoda <jlahoda at openjdk.org>
URL:       https://git.openjdk.java.net/jdk17/commit/4ee400ae433efbccd71cbebce6847033e76bc949
Stats:     164 lines in 7 files changed: 112 ins; 3 del; 49 mod

8268320: Better error recovery for broken patterns in switch

Reviewed-by: vromero

-------------

PR: https://git.openjdk.java.net/jdk17/pull/146