minor: Downgrade cyclic deps error to warning

crates/base-db/src/input.rs

@@ -374,37 +374,6 @@ impl CrateGraph {
         self.arena.alloc(data)
     }
 
-    /// Remove the crate from crate graph. If any crates depend on this crate, the dependency would be replaced
-    /// with the second input.
-    pub fn remove_and_replace(
-        &mut self,
-        id: CrateId,
-        replace_with: CrateId,
-    ) -> Result<(), CyclicDependenciesError> {
-        for (x, data) in self.arena.iter() {
-            if x == id {
-                continue;
-            }
-            for edge in &data.dependencies {
-                if edge.crate_id == id {
-                    self.check_cycle_after_dependency(edge.crate_id, replace_with)?;
-                }
-            }
-        }
-        // if everything was ok, start to replace
-        for (x, data) in self.arena.iter_mut() {
-            if x == id {
-                continue;
-            }
-            for edge in &mut data.dependencies {
-                if edge.crate_id == id {
-                    edge.crate_id = replace_with;
-                }
-            }
-        }
-        Ok(())
-    }
-
     pub fn add_dep(
         &mut self,
         from: CrateId,
@@ -412,26 +381,17 @@ impl CrateGraph {
     ) -> Result<(), CyclicDependenciesError> {
         let _p = tracing::info_span!("add_dep").entered();
 
-        self.check_cycle_after_dependency(from, dep.crate_id)?;
-
-        self.arena[from].add_dep(dep);
-        Ok(())
-    }
-
-    /// Check if adding a dep from `from` to `to` creates a cycle. To figure
-    /// that out, look for a  path in the *opposite* direction, from `to` to
-    /// `from`.
-    fn check_cycle_after_dependency(
-        &self,
-        from: CrateId,
-        to: CrateId,
-    ) -> Result<(), CyclicDependenciesError> {
-        if let Some(path) = self.find_path(&mut FxHashSet::default(), to, from) {
+        // Check if adding a dep from `from` to `to` creates a cycle. To figure
+        // that out, look for a  path in the *opposite* direction, from `to` to
+        // `from`.
+        if let Some(path) = self.find_path(&mut FxHashSet::default(), dep.crate_id, from) {
             let path = path.into_iter().map(|it| (it, self[it].display_name.clone())).collect();
             let err = CyclicDependenciesError { path };
-            assert!(err.from().0 == from && err.to().0 == to);
+            assert!(err.from().0 == from && err.to().0 == dep.crate_id);
             return Err(err);
         }
+
+        self.arena[from].add_dep(dep);
         Ok(())
     }
 

crates/project-model/src/workspace.rs

@@ -1554,6 +1554,6 @@ fn add_proc_macro_dep(crate_graph: &mut CrateGraph, from: CrateId, to: CrateId,
 
 fn add_dep_inner(graph: &mut CrateGraph, from: CrateId, dep: Dependency) {
     if let Err(err) = graph.add_dep(from, dep) {
-        tracing::error!("{}", err)
+        tracing::warn!("{}", err)
     }
 }