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Thanks @hellozzm! Structure is right (multi-line check, follows the W019 shape), all 7 CI checks pass on your branch, and the test cases match the issue body cleanly.

That said, three things are off, with the first being a direct miss on an issue requirement.

Issue body required nested-CASE detection. Currently broken. Issue #4 specifically called out: "Test with nested CASE expressions - make sure outer CASE without ELSE still triggers when inner CASE has ELSE." The rule fails exactly that case:

SELECT CASE
   WHEN x THEN CASE WHEN y THEN 1 ELSE 2 END
   WHEN z THEN 3
END FROM t;

Took this over the line. Rebased on main (which now has W015 from #33), reworked the rule into a depth-aware token walk so each CASE/END block is judged independently — the nested example from issue #4 now fires correctly, since the outer block tracks its own ELSE count. Standalone END (T-SQL BEGIN ... END) is ignored when no matching CASE is on the stack.

Added two regression tests: outer-CASE-without-ELSE-while-inner-has-ELSE, and a BEGIN/END block that should stay quiet. The original passing/failing tests still pass. CHANGELOG / README / key-numbers bumped to 42/27.

Squashing once CI settles. Thanks @hellozzm for the rule, the bones were right and the nesting fix was a small lift on top.