Minor cleanup.

Author: ehuss

src/cargo/core/resolver/features.rs

@@ -475,7 +475,6 @@ impl<'a, 'cfg> FeatureResolver<'a, 'cfg> {
                             // Activate the crate on self.
                             let fv = FeatureValue::Crate {
                                 dep_name: *dep_name,
-                                // explicit: *explicit,
                             };
                             self.activate_fv(pkg_id, &fv, for_host)?;
                             if !explicit {

src/cargo/core/summary.rs

@@ -350,8 +350,8 @@ impl FeatureValue {
             Some(pos) => {
                 let (dep, dep_feat) = feature.split_at(pos);
                 let dep_feat = &dep_feat[1..];
-                let (dep, explicit) = if dep.starts_with("crate:") {
-                    (&dep[6..], true)
+                let (dep, explicit) = if let Some(dep) = dep.strip_prefix("crate:") {
+                    (dep, true)
                 } else {
                     (dep, false)
                 };