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Currently, we generate `HAS_` constants as long as the definition exists in the source, regardless if it is cfg-ed out or not. Currently, uses of `#[cfg]` present in both trait and impl, so it is not a problem; however if only the impl side uses `#[cfg]` then `HAS_` constants will incorrectly be true while it shouldnt't. With `syn` support, we can now implement `#[cfg]` handling properly by propagating the `#[cfg]` attributes to the constants. Signed-off-by: Gary Guo <gary@garyguo.net> Reviewed-by: Benno Lossin <lossin@kernel.org> Link: https://patch.msgid.link/20260113170529.2240744-1-gary@kernel.org Signed-off-by: Miguel Ojeda <ojeda@kernel.org>