1.99 beta crater regression: "expected item after attributes"

This regression was found by the 1.99 crater --release mode run.

[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - YoshiBacktrace::new_captured (line 2609) stdout ----
[INFO] [stdout] error: expected item after attributes
[INFO] [stdout]     --> src/lib.rs:2610:1
[INFO] [stdout]      |
[INFO] [stdout] 2610 | #[cfg(feature = "std")] {
[INFO] [stdout]      | ^^^^^^^^^^^^^^^^^^^^^^^ expected an item after this
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] Couldn't compile the test.

https://crater-reports.s3.amazonaws.com/beta-release-1.99-3/1.99.0-beta.1%2Bcargoflags=--release/reg/yoshi-std-0.1.5/log.txt (note that this crate has two failures, the other one is #162349)

Relevant code: https://docs.rs/crate/yoshi-std/0.1.5/source/src/lib.rs#2609-2614

The code in this case has a typoed last line of documentation:

    /// # }    /// ```

This is, inside of a doctest, a closing brace, followed by a doc comment, without anything for the doc comment to attach to. So, if this test used to pass, it did so erroneously, perhaps by the doc comment attaching to some item appended to the doctest. #162349 appears to also have such a situation.

It does work on stable though. Using --test-builder-wrapper:

Code:

/// ```
/// #[cfg(true)] {
/// }    /// ```
pub fn wtf() {}

Input to rustc on stable:

#![allow(unused)]
fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_1_0() {
#[cfg(true)] {
}
} _doctest_main_src_lib_rs_1_0() }

Input to rustc on beta:

#[cfg(true)] {
}    /// ```

Rollup merge of rust-lang#162386 - JonathanBrouwer:doctest-attribute,…

Unrolled build for #162386 in rollup 162434

Rollup merge of #162386 - JonathanBrouwer:doctest-attribute, r=mejrs

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1.99 beta crater regression: "expected item after attributes" #162352

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1.99 beta crater regression: "expected item after attributes" #162352

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kpreid commented on Sep 6, 2026

maxdexh commented on Sep 6, 2026

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