test: prop test for error report and refactor

Cargo.toml

@@ -36,3 +36,7 @@ env_logger = "0.9.0"
 name = "large_case"
 harness = false
 required-features = ["serde"]
+
+# Optimize our dependencies for fasster tests
+[profile.dev.package."*"]
+# opt-level = 3

src/internal/arena.rs

@@ -55,7 +55,7 @@ impl<T> Id<T> {
     }
     fn from(n: u32) -> Self {
         Self {
-            raw: n as u32,
+            raw: n,
             _ty: PhantomData,
         }
     }

src/internal/partial_solution.rs

@@ -147,7 +147,7 @@ impl<P: Package, VS: VersionSet> PartialSolution<P, VS> {
             }
         }
         self.current_decision_level = self.current_decision_level.increment();
-        let mut pa = self
+        let pa = self
             .package_assignments
             .get_mut(&package)
             .expect("Derivations must already exist");
@@ -177,7 +177,7 @@ impl<P: Package, VS: VersionSet> PartialSolution<P, VS> {
         self.next_global_index += 1;
         match self.package_assignments.entry(package) {
             Entry::Occupied(mut occupied) => {
-                let mut pa = occupied.get_mut();
+                let pa = occupied.get_mut();
                 pa.highest_decision_level = self.current_decision_level;
                 match &mut pa.assignments_intersection {
                     // Check that add_derivation is never called in the wrong context.

src/report.rs

@@ -197,7 +197,7 @@ impl DefaultStringReporter {
     fn build_recursive<P: Package, VS: VersionSet>(&mut self, derived: &Derived<P, VS>) {
         self.build_recursive_helper(derived);
         if let Some(id) = derived.shared_id {
-            if self.shared_with_ref.get(&id) == None {
+            if self.shared_with_ref.get(&id).is_none() {
                 self.add_line_ref();
                 self.shared_with_ref.insert(id, self.ref_count);
             }
@@ -260,7 +260,7 @@ impl DefaultStringReporter {
                     //     and finally conclude.
                     (None, None) => {
                         self.build_recursive(derived1);
-                        if derived1.shared_id != None {
+                        if derived1.shared_id.is_some() {
                             self.lines.push("".into());
                             self.build_recursive(current);
                         } else {

src/solver.rs

@@ -175,14 +175,14 @@ pub fn resolve<P: Package, VS: VersionSet>(
             Dependencies::Known(x) if x.contains_key(p) => {
                 return Err(PubGrubError::SelfDependency {
                     package: p.clone(),
-                    version: v.clone(),
+                    version: v,
                 });
             }
             Dependencies::Known(x) => {
                 if let Some((dependent, _)) = x.iter().find(|(_, r)| r == &&VS::empty()) {
                     return Err(PubGrubError::DependencyOnTheEmptySet {
                         package: p.clone(),
-                        version: v.clone(),
+                        version: v,
                         dependent: dependent.clone(),
                     });
                 }