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5 changes: 5 additions & 0 deletions src/cargo/ops/cargo_package/mod.rs
Original file line number Diff line number Diff line change
Expand Up @@ -417,6 +417,11 @@ fn local_deps<T>(packages: impl Iterator<Item = (Package, T)>) -> LocalDependenc
continue;
};

// We don't care about cycles
if dep.source_id() == pkg.package_id().source_id() {
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@weihanglo weihanglo Jun 4, 2025

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It is a bit unintuitive, as comparing source_id doesn't generally imply they are cyclic. However, given we filtered in local packages earlier (which source ID contains path to package root as the unique identifer), it makes sense.

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Yeah, in general this code assumes that the source_id is unique and looks up a package id by the source id. I could move this into the following if so we can then compare package ids. That won't make a practical differende but maybe it makes the intent clearer?

continue;
}

if let Some(dep_pkg) = source_to_pkg.get(&dep.source_id()) {
graph.link(pkg.package_id(), *dep_pkg);
}
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33 changes: 33 additions & 0 deletions tests/testsuite/package.rs
Original file line number Diff line number Diff line change
Expand Up @@ -7560,6 +7560,39 @@ fn unpublished_cyclic_dev_dependencies() {
);
}

#[cargo_test]
fn unpublished_cyclic_dev_dependencies_nightly() {
registry::init();
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.0.1"
edition = "2015"
authors = []
license = "MIT"
description = "foo"
documentation = "foo"

[dev-dependencies]
foo = { path = ".", version = "0.0.1" }
"#,
)
.file("src/lib.rs", "")
.build();

p.cargo("package --no-verify --exclude-lockfile -Zpackage-workspace")
.masquerade_as_nightly_cargo(&["package-workspace"])
.with_stderr_data(str![[r#"
[PACKAGING] foo v0.0.1 ([ROOT]/foo)
[PACKAGED] 3 files, [FILE_SIZE]B ([FILE_SIZE]B compressed)

"#]])
.run();
}

// A failing case from <https://github.com/rust-lang/cargo/issues/15059>
#[cargo_test]
fn unpublished_dependency() {
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