ICE in cargo doc with optin_builtin_traits #55321
Description
Hi, I noticed a weird internal error using cargo doc. The smallest example I could make to reproduce the bug is an basic library project (cargo init --lib) whose lib.rs contains:
#![feature(optin_builtin_traits)]
// the bug doesn't occur if the declaration of B is moved here
pub struct A();
// the bug still happens if the declaration of B is moved here
impl !Send for A {}
impl !Sync for A {}
pub struct B<T: ?Sized>(A, Box<T>);cargo build, cargo build --release, and cargo check all work fine; and as mentioned in the code, the place where B is declared seems to matter.
Here is the output and trace of cargo doc --verbose: [log was from an out of date nightly rust, see my comment below for the log for the latest nightly as of this edit]
Have a nice day.