Panic while formatting doc comment with nested block quotations

[scouten-adobe]

Nightly build of rustfmt panics while formatting code with nested block quotation sections.

Test case, including rustc-ice log file is available here: contentauth/c2pa-rs#808. The last commit in that PR introduces changes that cause the panic.

[scouten-adobe]

I'll close the PR on our end since we can't merge it as is, but leave it available for your team to inspect.

[scouten-adobe]

Removing the nested block quote (as I did in contentauth/c2pa-rs@9bd8350) seems to avoid the issue.

This is not a blocker for us; providing the bug report as an FYI.

[ytmimi]

@scouten-adobe what version of rustfmt were you running (can you run rustfmt --version), and what configurations are you using?

Also, it would be very helpful if you could post a minimal reproduction here instead of linking to a PR.

[scouten-adobe]

$ cargo +nightly fmt --version
rustfmt 1.8.0-nightly (14ee63a3c6 2024-12-29)

@ytmimi I'm on critical path for some other tasks, so I can't really take time to create a minimal repro. As I said, this is not a blocker for us.

[ytmimi]

It doesn't have to be right now, but if you could revisit this again when you have some time that would help.