Fix panic when running cargo tree on a package with a cross compile…

…d bindep

src/cargo/ops/tree/graph.rs

@@ -391,10 +391,32 @@ fn add_pkg(
         let dep_pkg = graph.package_map[&dep_id];
 
         for dep in deps {
-            let dep_features_for = if dep.is_build() || dep_pkg.proc_macro() {
-                FeaturesFor::HostDep
-            } else {
-                features_for
+            let dep_features_for = match dep
+                .artifact()
+                .and_then(|artifact| artifact.target())
+                .and_then(|target| target.to_resolved_compile_target(requested_kind))
+            {
+                // Dependency has a `{ …, target = <triple> }`
+                Some(target) => FeaturesFor::ArtifactDep(target),
+                // Get the information of the dependent crate from `features_for`.
+                // If a dependent crate is
+                //
+                // * specified as an artifact dep with a `target`, or
+                // * a host dep,
+                //
+                // its transitive deps, including build-deps, need to be built on that target.
+                None if features_for != FeaturesFor::default() => features_for,
+                // Dependent crate is a normal dep, then back to old rules:
+                //
+                // * normal deps, dev-deps -> inherited target
+                // * build-deps -> host
+                None => {
+                    if dep.is_build() || dep_pkg.proc_macro() {
+                        FeaturesFor::HostDep
+                    } else {
+                        features_for
+                    }
+                }
             };
             let dep_index = add_pkg(
                 graph,

tests/testsuite/artifact_dep.rs

@@ -1568,15 +1568,14 @@ fn artifact_dep_target_specified() {
         .with_status(0)
         .run();
 
-    // TODO: This command currently fails due to a bug in cargo but it should be fixed so that it succeeds in the future.
     p.cargo("tree -Z bindeps")
         .masquerade_as_nightly_cargo(&["bindeps"])
-        .with_stdout_data("")
-        .with_stderr_data(r#"...
-[..]did not find features for (PackageId { name: "bindep", version: "0.0.0", source: "[..]" }, NormalOrDev) within activated_features:[..]
-...
-"#)
-        .with_status(101)
+        .with_stdout_data(str![[r#"
+foo v0.0.0 ([ROOT]/foo)
+└── bindep v0.0.0 ([ROOT]/foo/bindep)
+
+"#]])
+        .with_status(0)
         .run();
 }