`cargo tree -Z bindeps` panics for artifact build-dependency with `target = "target"`

[wan9chi]

Problem

cargo tree -Z bindeps can panic for an artifact build-dependency declared with target = "target" when no explicit --target is passed.

cargo check -Z bindeps succeeds for the same project, but cargo tree -Z bindeps panics instead of printing the dependency tree.

Expected behavior: cargo tree -Z bindeps prints the dependency tree.

Actual behavior: cargo tree -Z bindeps panics.

Reproduction log

Reproduced on current nightly with the repro from the issue, without passing an explicit --target.

$ cargo +nightly -Vv
cargo 1.98.0-nightly (598ab48ec 2026-06-17)
release: 1.98.0-nightly
commit-hash: 598ab48ec328e3e4f5e4e373d8df7264bc8e27cd
commit-date: 2026-06-17
host: aarch64-apple-darwin
libgit2: 1.9.4 (sys:0.21.0 vendored)
libcurl: 8.7.1 (sys:0.4.88+curl-8.20.0 system ssl:(SecureTransport) LibreSSL/3.3.6)
ssl: OpenSSL 3.6.2 7 Apr 2026
os: Mac OS 26.5.1 [64-bit]

cargo check -Z bindeps succeeds:

$ cargo +nightly check -Z bindeps
     Locking 2 packages to latest Rust 1.98.0-nightly compatible versions
   Compiling pm v0.1.0 (/private/tmp/cargo-issue-17125-repro/pm)
   Compiling foo v0.0.0 (/private/tmp/cargo-issue-17125-repro)
   Compiling bar v0.5.0 (/private/tmp/cargo-issue-17125-repro/bar)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.57s

cargo tree -Z bindeps panics:

$ RUST_BACKTRACE=1 cargo +nightly tree -Z bindeps

thread 'main' (43603029) panicked at src/tools/cargo/src/cargo/core/resolver/features.rs:325:13:
did not find features for (PackageId { name: "bar", version: "0.5.0", source: "/private/tmp/cargo-issue-17125-repro/bar" }, HostDep) within activated_features:
[
    (
        PackageId {
            name: "pm",
            version: "0.1.0",
            source: "/private/tmp/cargo-issue-17125-repro/pm",
        },
        HostDep,
    ),
    (
        PackageId {
            name: "foo",
            version: "0.0.0",
            source: "/private/tmp/cargo-issue-17125-repro",
        },
        NormalOrDev,
    ),
    (
        PackageId {
            name: "bar",
            version: "0.5.0",
            source: "/private/tmp/cargo-issue-17125-repro/bar",
        },
        ArtifactDep(
            Tuple(
                "aarch64-apple-darwin",
            ),
        ),
    ),
]
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: <cargo::core::resolver::features::ResolvedFeatures>::activated_features
   3: cargo::ops::tree::graph::add_pkg
   4: cargo::ops::tree::graph::add_pkg
   5: cargo::ops::tree::build_and_print
   6: cargo::commands::tree::exec
   7: <cargo::cli::Exec>::exec
   8: cargo::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

This is related to prior bindeps / cargo tree bugs such as #10593 and #12358, but this case appears distinct because it depends on target = "target".

Steps

Create this project:

# Cargo.toml
[package]
name = "foo"
version = "0.0.0"
edition = "2024"
resolver = "3"

[build-dependencies]
bar = { path = "bar", artifact = "cdylib", target = "target" }

// src/lib.rs

// build.rs
fn main() {}

# bar/Cargo.toml
[package]
name = "bar"
version = "0.5.0"
edition = "2024"
resolver = "3"

[lib]
crate-type = ["cdylib"]

[dependencies]
pm = { path = "../pm" }

// bar/src/lib.rs

# pm/Cargo.toml
[package]
name = "pm"
version = "0.1.0"
edition = "2024"
resolver = "3"

[lib]
proc-macro = true

// pm/src/lib.rs

Then run:

$ cargo +nightly check -Z bindeps
$ cargo +nightly tree -Z bindeps

check succeeds, but tree panics.

A draft PR with a regression test is available at #17124.

Version

cargo 1.96.0 (30a34c682 2026-05-25)
release: 1.96.0
commit-hash: 30a34c6821b57de0aaec83a901aca39f88f6778c
commit-date: 2026-05-25
host: aarch64-apple-darwin
libgit2: 1.9.2 (sys:0.20.4 vendored)
libcurl: 8.7.1 (sys:0.4.87+curl-8.19.0 system ssl:(SecureTransport) LibreSSL/3.3.6)
ssl: OpenSSL 3.5.4 30 Sep 2025
os: Mac OS 26.5.1 [64-bit]