[Issue 21341] [REG2.092] Wrong reference escape error when parameter is stored in this

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21341

--- Comment #1 from johanengelen at weka.io ---
Workaround: use explicit pointer parameter (`Watcher*`) instead of reference
(`ref Watcher`).

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