Add a rule for attribute macro outline modules#2310
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rust-lang/rust#157857 stabilized the ability to use `#[my macro] mod foo;`. The reference never specified that this was not allowed, so it doesn't absolutely need to be changed for this. However, since this was something that the lang team considered deeply enough on its own, it seems worthy to be explicit about this behavior.
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rust-lang/rust#157857 stabilized the ability to use
#[my macro] mod foo;. The reference never specified that this was not allowed, so it doesn't absolutely need to be changed for this. However, since this was something that the lang team considered deeply enough on its own, it seems worthy to be explicit about this behavior.This is an alternative to #2284. Since we already have a rule that specifies where the attributes are allowed, this follows more closely to that to specify the behavior when applied to one of these module items.