Auto merge of #14090 - Eh2406:clean_up_public_deps, r=weihanglo

remove some legacy public dependency code from the resolver

These conflict reasons are no longer constructed, since we removed backtracking caused by public dependencies. Let's go ahead and remove them.

r? `@epage`

src/cargo/core/resolver/conflict_cache.rs

@@ -194,11 +194,6 @@ impl ConflictCache {
     /// `dep` is known to be unresolvable if
     /// all the `PackageId` entries are activated.
     pub fn insert(&mut self, dep: &Dependency, con: &ConflictMap) {
-        if con.values().any(|c| c.is_public_dependency()) {
-            // TODO: needs more info for back jumping
-            // for now refuse to cache it.
-            return;
-        }
         self.con_from_dep
             .entry(dep.clone())
             .or_insert_with(|| ConflictStoreTrie::Node(BTreeMap::new()))

src/cargo/core/resolver/errors.rs

@@ -193,14 +193,6 @@ pub(super) fn activation_error(
                     );
                     // p == parent so the full path is redundant.
                 }
-                ConflictReason::PublicDependency(pkg_id) => {
-                    // TODO: This needs to be implemented.
-                    unimplemented!("pub dep {:?}", pkg_id);
-                }
-                ConflictReason::PubliclyExports(pkg_id) => {
-                    // TODO: This needs to be implemented.
-                    unimplemented!("pub exp {:?}", pkg_id);
-                }
             }
         }
 

src/cargo/core/resolver/mod.rs

@@ -820,10 +820,6 @@ fn generalize_conflicting(
     let backtrack_critical_reason: ConflictReason =
         conflicting_activations[&backtrack_critical_id].clone();
 
-    if backtrack_critical_reason.is_public_dependency() {
-        return None;
-    }
-
     if cx
         .parents
         .is_path_from_to(&parent.package_id(), &backtrack_critical_id)

src/cargo/core/resolver/types.rs

@@ -300,12 +300,6 @@ pub enum ConflictReason {
     /// A dependency listed a feature for an optional dependency, but that
     /// optional dependency is "hidden" using namespaced `dep:` syntax.
     NonImplicitDependencyAsFeature(InternedString),
-
-    // TODO: needs more info for `activation_error`
-    // TODO: needs more info for `find_candidate`
-    /// pub dep error
-    PublicDependency(PackageId),
-    PubliclyExports(PackageId),
 }
 
 impl ConflictReason {
@@ -320,13 +314,6 @@ impl ConflictReason {
     pub fn is_required_dependency_as_features(&self) -> bool {
         matches!(self, ConflictReason::RequiredDependencyAsFeature(_))
     }
-
-    pub fn is_public_dependency(&self) -> bool {
-        matches!(
-            self,
-            ConflictReason::PublicDependency(_) | ConflictReason::PubliclyExports(_)
-        )
-    }
 }
 
 /// A list of packages that have gotten in the way of resolving a dependency.