Trim diff down further

Author: konstin

tests/proptest.rs

@@ -37,7 +37,7 @@ impl<P: Package, VS: VersionSet> DependencyProvider for OldestVersionsDependency
         &self,
         p: &P,
         v: &VS::V,
-    ) -> Result<Dependencies<Self::P, Self::VS, Self::M>, Self::Err> {
+    ) -> Result<Dependencies<P, VS, Self::M>, Infallible> {
         self.0.get_dependencies(p, v)
     }
 
@@ -353,7 +353,7 @@ fn retain_dependencies<N: Package + Ord, VS: VersionSet>(
                 n.clone(),
                 v.clone(),
                 deps.iter().filter_map(|(dep, range)| {
-                    if !retain(n, v, &dep) {
+                    if !retain(n, v, dep) {
                         None
                     } else {
                         Some((dep.clone(), range.clone()))