regression: type is now private?

[Mark-Simulacrum]

[INFO] [stdout] error: type `bright_lang_lexer::SingleLineCommentToken` is private
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/logos-0.11.4/src/lexer.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     source: &'source Token::Source,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ private type

• https://crater-reports.s3.amazonaws.com/beta-1.78-3/beta-2024-03-30/gh/theidiotmachine.bright-lang/log.txt

[Noratrieb]

searched nightlies: from nightly-2024-02-01 to nightly-2024-03-20
regressed nightly: nightly-2024-02-10
searched commit range: 98aa362...d44e3b9
regressed commit: e28fae5

bisected with cargo-bisect-rustc v0.6.8

Host triple: x86_64-unknown-linux-gnu
Reproduce with:

cargo bisect-rustc github --start 2024-02-01 --end 2024-03-20 

probably #113671 @oli-obk

[apiraino]

WG-prioritization assigning priority (Zulip discussion).

@rustbot label -I-prioritize +P-high

[oli-obk]

MCVE

mod baz {
    struct Foo;

    pub trait Trait {
        type Assoc;
    }

    impl Trait for Foo {
        type Assoc = ();
    }

    pub struct Bar<'a, T: Trait> {
        source: &'a T::Assoc,
        //~^ ERROR: private type
    }

    pub struct Baz<'a> {
        mode: Bar<'a, Foo>,
    }
}

pub struct Struct<'a> {
    lexer: baz::Baz<'a>,
}