Rustfmt discards newlines between `#[doc]` attributes and other attributes

[jyn514]

Input

//! Some docs here
#![cfg_attr(bootstrap, doc = "xxx")]

#![cfg_attr(debug_assertions, stable(feature = "rust1", since = "1.0.0"))]

Output

//! Some docs here
#![cfg_attr(bootstrap, doc = "xxx")]
#![cfg_attr(debug_assertions, stable(feature = "rust1", since = "1.0.0"))]

Expected output

//! Some docs here
#![cfg_attr(bootstrap, doc = "xxx")]

#![cfg_attr(debug_assertions, stable(feature = "rust1", since = "1.0.0"))]

I see here why rustfmt did this - it thinks that all cfg_attr attributes should be grouped together. But this doesn't make sense in the semantic context of the program: cfg_attr(doc) is a doc-comment and should be grouped with other doc-comments. See rust-lang/rust#80181 (comment) for a more realistic example.

Is there a way to disable this behavior?

Meta

• rustfmt version: rustfmt 1.4.24-stable (eb894d5 2020-11-05)
• From where did you install rustfmt?: rustup

[calebcartwright]

Going to close as a duplicate of #4082. The context here around doc comments is helpful as additional reference cases/motivation, but fundamentally relates to the same lack of support (default or opt-in) for newlines between attrs

Is there a way to disable this behavior?

Not categorically, but #[rustfmt::skip] and/or #[rustfmt::skip::attributes(cfg_attr)] could potentially be of use