doc(features2): clarify some docs

src/cargo/core/compiler/unit_dependencies.rs

@@ -1031,6 +1031,7 @@ impl<'a, 'cfg> State<'a, 'cfg> {
         }
     }
 
+    /// See [`ResolvedFeatures::activated_features`].
     fn activated_features(
         &self,
         pkg_id: PackageId,
@@ -1040,6 +1041,7 @@ impl<'a, 'cfg> State<'a, 'cfg> {
         features.activated_features(pkg_id, features_for)
     }
 
+    /// See [`ResolvedFeatures::is_activated`].
     fn is_activated(&self, pkg_id: PackageId, features_for: FeaturesFor) -> bool {
         self.features().is_activated(pkg_id, features_for)
     }

src/cargo/core/resolver/features.rs

@@ -49,11 +49,9 @@ type ActivateMap = HashMap<PackageFeaturesKey, BTreeSet<InternedString>>;
 
 /// Set of all activated features for all packages in the resolve graph.
 pub struct ResolvedFeatures {
+    /// Map of features activated for each package.
     activated_features: ActivateMap,
-    /// Optional dependencies that should be built.
-    ///
-    /// The value is the `name_in_toml` of the dependencies.
-    activated_dependencies: ActivateMap,
+    /// Options that change how the feature resolver operates.
     opts: FeatureOpts,
 }
 
@@ -315,10 +313,10 @@ impl ResolvedFeatures {
             .expect("activated_features for invalid package")
     }
 
-    /// Returns if the given dependency should be included.
+    /// Asks the resolved features if the given package should be included.
     ///
-    /// This handles dependencies disabled via `cfg` expressions and optional
-    /// dependencies which are not enabled.
+    /// One scenario to use this function is to deteremine a optional dependency
+    /// should be built or not.
     pub fn is_activated(&self, pkg_id: PackageId, features_for: FeaturesFor) -> bool {
         log::trace!("is_activated {} {features_for}", pkg_id.name());
         self.activated_features_unverified(pkg_id, features_for.apply_opts(&self.opts))