expand: Feature gate out-of-line modules in proc macro input #66078
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expand: Feature gate out-of-line modules in proc macro input Extracted from #64273. We are currently gating attributes applied directly to `mod` items because there are unresolved questions about out-of-line modules and their behavior is very likely to change. However, you can sneak an out-of-line module into an attribute macro input using modules nested into other items like ```rust #[my_attr] fn m() { #[path = "zzz.rs"] mod n; // what tokens does the `my_attr` macro see? } ``` This PR prevents that and emits a feature gate error for this case as well. r? @Centril It would be great to land this before beta.
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Extracted from #64273.
We are currently gating attributes applied directly to
moditems because there are unresolved questions about out-of-line modules and their behavior is very likely to change.However, you can sneak an out-of-line module into an attribute macro input using modules nested into other items like
This PR prevents that and emits a feature gate error for this case as well.
r? @Centril
It would be great to land this before beta.