This repository shows how to integrate generated code whose top-level file contains inner attributes (#![...]).

include!(...); cannot be used when the file to include has inner attributes (bug). #[path = "..."] mod foo; works in that case, as long as the path can be written down, which excludes it depending on an environment variable like OUT_DIR which is where Rust scripts are meant to write generated code.

This crate shows a mix of both ways that does the trick. The code is generated in $OUT_DIR/foo and a helper file $OUT_DIR/wrap.rs is also written with the following contents:

pub mod foo;

The code in src can just do include!(concat!(env!("OUT_DIR"), "/wrap.rs")); and use module foo.