Distinguish versions of a crate loaded from the sysroot and from cargo

[jyn514]

Code

// inner/Cargo.toml
[package]
name = "inner"
edition = "2021"

[dependencies]
hashbrown = "0.12.3"

// inner/src/lib.rs
pub fn foo(_: hashbrown::HashMap<u32, u32>) {}

// outer/src/main.rs
#![feature(rustc_private)]
extern crate hashbrown;

fn main() {
    let map = hashbrown::HashMap::default();
    inner::foo(map);
}

Current output

error[E0308]: mismatched types
   --> src/main.rs:6:16
    |
6   |     inner::foo(map);
    |     ---------- ^^^ expected `HashMap<u32, u32>`, found `HashMap<_, _, _, _>`
    |     |
    |     arguments to this function are incorrect
    |
    = note: `HashMap<_, _, _, _>` and `HashMap<u32, u32>` have similar names, but are actually distinct types
note: `HashMap<_, _, _, _>` is defined in crate `hashbrown`
   --> /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/hashbrown-0.12.3/src/map.rs:188:1
note: `HashMap<u32, u32>` is defined in crate `hashbrown`
   --> /Users/jyn/.local/lib/cargo/registry/src/index.crates.io-6f17d22bba15001f/hashbrown-0.12.3/src/map.rs:188:1
    |
188 | pub struct HashMap<K, V, S = DefaultHashBuilder, A: Allocator + Clone = Global> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: perhaps two different versions of crate `hashbrown` are being used?
note: function defined here
   --> /Users/jyn/src/example/inner/src/lib.rs:1:8
    |
1   | pub fn foo(_: hashbrown::HashMap<u32, u32>) {}
    |        ^^^

Desired output

note: `HashMap<_, _, _, _>` is defined in crate `hashbrown`
   --> /Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/hashbrown-0.12.3/src/map.rs:188:1
   = note: loaded from /Users/jyn/.local/lib/rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/aarch64-apple-darwin/lib/libhashbrown-016a8bf1dc67c69f.rlib
   = note: which is in the compiler's "sysroot": https://rustc-dev-guide.rust-lang.org/building/bootstrapping.html#what-is-a-sysroot
note: `HashMap<u32, u32>` is defined in crate `hashbrown` (loaded from `/Users/jyn/.local/lib/cargo/target/debug/deps/`)
   --> /Users/jyn/.local/lib/cargo/registry/src/index.crates.io-6f17d22bba15001f/hashbrown-0.12.3/src/map.rs:188:1
    |
188 | pub struct HashMap<K, V, S = DefaultHashBuilder, A: Allocator + Clone = Global> {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    = note: loaded from /Users/jyn/.local/lib/cargo/target/debug/deps/libhashbrown-408ce4dce55d643d.rmeta
    = note: perhaps two different versions of crate `hashbrown` are being used?

Rationale and extra context

It's not clear that "/Users/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/hashbrown-0.12.3/src/map.rs:188:1" is referring to a crate loaded from the sysroot; that path doesn't correspond to anything on disk. It would be nice to explain what's going on; when dealing with sysroots the exact paths of the artifacts often really are important.

Other cases

No response

Anything else?

This is minimized from a real error @aDotInTheVoid saw in rustdoc:

   Compiling rustdoc v0.0.0 (/home/alona/dev/rust/rust/src/librustdoc)
error[E0308]: mismatched types
   --> src/librustdoc/json/mod.rs:235:13
    |
235 |             index,
    |             ^^^^^ expected `rustc_hash::FxHasher`, found `FxHasher`
    |
    = note: `FxHasher` and `rustc_hash::FxHasher` have similar names, but are actually distinct types
note: `FxHasher` is defined in crate `rustc_hash`
   --> /cargo/registry/src/index.crates.io-6f17d22bba15001f/rustc-hash-1.1.0/src/lib.rs:60:1
note: `rustc_hash::FxHasher` is defined in crate `rustc_hash`
   --> /home/alona/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustc-hash-1.1.0/src/lib.rs:60:1
    |
60  | pub struct FxHasher {
    | ^^^^^^^^^^^^^^^^^^^
    = note: perhaps two different versions of crate `rustc_hash` are being used?