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Like those created by Form editor. Since the user does not have any chance to fix them. Or at least there should be an option for turning this off. UnusedFormalParameter for 'evt' parameter is really popular in this context ;)
Personally I do not like this rule. Another pattern that we generate is described in issue #72346 Perhaps we can supress output related to text in guarded block.
I am not going to fix this. Feel free to contribute.