Trim diff down further

Author: konstin

src/solver.rs

@@ -393,7 +393,7 @@ impl<P: Package, VS: VersionSet> DependencyProvider for OfflineDependencyProvide
         &self,
         package: &P,
         version: &VS::V,
-    ) -> Result<Dependencies<Self::P, Self::VS, Self::M>, Self::Err> {
+    ) -> Result<Dependencies<P, VS, Self::M>, Infallible> {
         Ok(match self.dependencies(package, version) {
             None => {
                 Dependencies::Unavailable("its dependencies could not be determined".to_string())