format comments bug: comment merges with the next line even if it's a code block opener

[msrd0]

I just ran rustfmt on bytemuck (da748163ea203f80098b6bdc754c54ebc535364c) and then this happened:

diff --git a/src/transparent.rs b/src/transparent.rs
index a588eea..de099db 100644
--- a/src/transparent.rs
+++ b/src/transparent.rs
@@ -103,9 +103,9 @@ use super::*;
 /// #[derive(TransparentWrapper)]
 /// #[repr(transparent)]
 /// #[transparent(usize)]
-/// struct Wrapper<T: ?Sized>(usize, PhantomData<T>); // PhantomData<T> implements Zeroable for all T
-/// ```
-///
+/// struct Wrapper<T: ?Sized>(usize, PhantomData<T>); // PhantomData<T>
+/// implements Zeroable for all T ```
+///
 /// Here, an error will occur, because `MyZst` does not implement `Zeroable`.
 #[cfg_attr(feature = "derive", doc = "```compile_fail")]
 #[cfg_attr(

This feels like #4158 except that issue was fixed in 2020 and my rustfmt is newer:

$ cargo +nightly fmt -- -V
rustfmt 1.8.0-nightly (54a8a1db60 2025-09-26)

[shulaoda]

I looked into the issue and found that it has already been fixed in the latest branch. We may just need to wait until the src/tools/rustfmt submodule in rust-lang/rust is synced with the latest changes from rust-lang/rustfmt.

[msrd0]

Interesting, I was kind-of expecting to get the nightly version of rustfmt with a nightly compiler ... and then I just realised that there is a changelog entry for rustfmt 1.9.0 from january but my local rustfmt still reports its version as 1.8.0?