Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
2026-09-21 15:08:50 +00:00
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+/**
+ * A primitive pattern placed after the reference pattern that already matches every Integer.
+ * The compiler rejects it on both 26 and 27. Driven by scripts/broken-on-27.sh.
+ */
+public class Dominated {
+    static String describe(Object o) {
+        return switch (o) {
+            case Integer boxed -> "an Integer";
+            case int primitive -> "an int";        // dominated: every Integer is already caught above
+            default -> "something else";
+        };
+    }
+}