Rfcs: include! macro fails if included file has top-level inner attributes

[steveklabnik]

Issue by dwrensha
_Sunday Nov 09, 2014 at 14:25 GMT_

_For earlier discussion, see https://github.com/rust-lang/rust/issues/18810_

_This issue was labelled with: in the Rust repository_

---

// test.rs

pub mod included {
    include!("test_included.rs")
}

fn main() {}

// test_included.rs

#![allow(dead_code)]

pub fn foo() {}

$ rustc test.rs
test_included.rs:3:3: 3:4 error: an inner attribute is not permitted in this context
test_included.rs:3 #![allow(dead_code)]
                     ^
error: aborting due to previous error

I at first thought that the problem was due to the implicit insert of the prelude in the included module. However, adding a #[no_implicit_prelude] attribute does not help.

[SimonSapin]

Is this fixed by https://github.com/rust-lang/meeting-minutes/blob/master/weekly-meetings/2015-01-20.md#goodbye-view-items ?

[dwrensha]

On the latest nightly, I still get the same error (after inserting a semicolon to account for the new macro syntax).

[SirVer]

Future searchers: I stumbled on this issue as I created a generated module in build.rs and https://github.com/rust-lang/rust/issues/18810 contained a work around that helped me.

[peterhuene]

After running into this issue still, I implemented a hacky workaround for this issue with the upcoming procedural macros feature: https://github.com/peterhuene/azure-functions-rs/blob/master/azure-functions-shared-codegen/src/lib.rs

[nixomose]

Future searchers: I stumbled on this issue as I created a generated module in build.rs and rust-lang/rust#18810 contained a work around that helped me.

Future searchers who happen to be rust newbies might be interested to know what you mean by "a work around"
I read the ticket, nothing jumped out at me, and everything I tried failed to yield any result.

I am following this guide for bindgen:
https://rust-lang.github.io/rust-bindgen/tutorial-4.html
and getting this:

error: an inner attribute is not permitted in this context
|
6 | #![allow(non_snake_case)];
| ^^^^^^^^^^^^^^^^^^^^^^^^^

It is hard to google for the difference between #![allow... and #[allow... and although the error explains what the difference between an inner and outer attribute is, it doesn't explain help me understand why the tutorial doesn't work as explained.