Normalization differs for dependencies and dev-dependencies

[shepmaster]

I have a library that's tested by trybuild in a subproject (roughly this structure):

.
├── Cargo.lock
├── Cargo.toml
├── compile-fail
│   ├── Cargo.lock
│   ├── Cargo.toml
│   ├── src
│   │   └── lib.rs
│   └── tests
│       └── ui
│           ├── repro.rs
│           └── repro.stderr
└── src
    └── lib.rs

src/lib.rs

pub trait MyTrait {}

impl MyTrait for i32 {}

compile-fail/src/lib.rs

#[test]
fn ui() {
    let t = trybuild::TestCases::new();
    t.compile_fail("tests/ui/*.rs");
}

compile-fail/tests/ui/repro.rs

use some_library::MyTrait;

fn repro() -> impl MyTrait {}

fn main() {}

Notably, I include trybuild and my library as dev-dependencies since they are only being used for tests:

compile-fail/Cargo.toml

[package]
name = "alpha"
version = "0.1.0"
edition = "2024"

[dev-dependencies]
trybuild = "1.0"
some-library = { path = ".." }

This results in a non-normalized stderr:

compile-fail/tests/ui/repro.stderr

error[E0277]: the trait bound `(): MyTrait` is not satisfied
 --> tests/ui/repro.rs:3:15
  |
3 | fn repro() -> impl MyTrait {}
  |               ^^^^^^^^^^^^ the trait `MyTrait` is not implemented for `()`
  |
help: the trait `MyTrait` is implemented for `i32`
 --> /private/tmp/alpha/src/lib.rs:3:1
  |
3 | impl MyTrait for i32 {}
  | ^^^^^^^^^^^^^^^^^^^^

If I change to including it as dependencies, the path is normalized:

error[E0277]: the trait bound `(): MyTrait` is not satisfied
 --> tests/ui/repro.rs:3:15
  |
3 | fn repro() -> impl MyTrait {}
  |               ^^^^^^^^^^^^ the trait `MyTrait` is not implemented for `()`
  |
help: the trait `MyTrait` is implemented for `i32`
 --> $SOME_LIBRARY/src/lib.rs
  |
  | impl MyTrait for i32 {}
  | ^^^^^^^^^^^^^^^^^^^^

---

Ideally, both dependencies and dev-dependencies would be normalized the same way. Barring that, it'd be nice to note somewhere the intentional difference between the two. I actually didn't find any docs that mention that normalization occurred at all...

I've actually been using trybuild since mid-2019 and never realized that this feature existed / that I was missing it.