3 files changed, 29 insertions, 13 deletions

diff --git a/crates/project_model/src/lib.rs b/crates/project_model/src/lib.rs
index 288c39e49..258f60e28 100644
--- a/crates/project_model/src/lib.rs
+++ b/crates/project_model/src/lib.rs
@@ -308,7 +308,13 @@ impl ProjectWorkspace {
                     .crates()
                     .filter_map(|(crate_id, krate)| {
                         let file_path = &krate.root_module;
-                        let file_id = load(&file_path)?;
+                        let file_id = match load(&file_path) {
+                            Some(id) => id,
+                            None => {
+                                log::error!("failed to load crate root {}", file_path.display());
+                                return None;
+                            }
+                        };
 
                         let env = krate.env.clone().into_iter().collect();
                         let proc_macro = krate
diff --git a/crates/project_model/src/project_json.rs b/crates/project_model/src/project_json.rs
index 545f254aa..a6895ecdd 100644
--- a/crates/project_model/src/project_json.rs
+++ b/crates/project_model/src/project_json.rs
@@ -13,7 +13,7 @@ use crate::cfg_flag::CfgFlag;
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct ProjectJson {
     pub(crate) sysroot_src: Option<AbsPathBuf>,
-    project_root: Option<AbsPathBuf>,
+    project_root: AbsPathBuf,
     crates: Vec<Crate>,
 }
 
@@ -34,10 +34,17 @@ pub struct Crate {
 }
 
 impl ProjectJson {
+    /// Create a new ProjectJson instance.
+    ///
+    /// # Arguments
+    ///
+    /// * `base` - The path to the workspace root (i.e. the folder containing `rust-project.json`)
+    /// * `data` - The parsed contents of `rust-project.json`, or project json that's passed via
+    ///            configuration.
     pub fn new(base: &AbsPath, data: ProjectJsonData) -> ProjectJson {
         ProjectJson {
             sysroot_src: data.sysroot_src.map(|it| base.join(it)),
-            project_root: base.parent().map(AbsPath::to_path_buf),
+            project_root: base.to_path_buf(),
             crates: data
                 .crates
                 .into_iter()
@@ -85,17 +92,17 @@ impl ProjectJson {
                 .collect::<Vec<_>>(),
         }
     }
+    /// Returns the number of crates in the project.
     pub fn n_crates(&self) -> usize {
         self.crates.len()
     }
+    /// Returns an iterator over the crates in the project.
     pub fn crates(&self) -> impl Iterator<Item = (CrateId, &Crate)> + '_ {
         self.crates.iter().enumerate().map(|(idx, krate)| (CrateId(idx as u32), krate))
     }
-    pub fn path(&self) -> Option<&AbsPath> {
-        match &self.project_root {
-            Some(p) => Some(p.as_path()),
-            None => None,
-        }
+    /// Returns the path to the project's root folder.
+    pub fn path(&self) -> &AbsPath {
+        &self.project_root
     }
 }
 
diff --git a/crates/rust-analyzer/src/reload.rs b/crates/rust-analyzer/src/reload.rs
index b819618cb..b070087a4 100644
--- a/crates/rust-analyzer/src/reload.rs
+++ b/crates/rust-analyzer/src/reload.rs
@@ -201,11 +201,14 @@ impl GlobalState {
             let mut crate_graph = CrateGraph::default();
             let vfs = &mut self.vfs.write().0;
             let loader = &mut self.loader;
+            let mem_docs = &self.mem_docs;
             let mut load = |path: &AbsPath| {
-                let contents = loader.handle.load_sync(path);
-                let path = vfs::VfsPath::from(path.to_path_buf());
-                vfs.set_file_contents(path.clone(), contents);
-                vfs.file_id(&path)
+                let vfs_path = vfs::VfsPath::from(path.to_path_buf());
+                if !mem_docs.contains_key(&vfs_path) {
+                    let contents = loader.handle.load_sync(path);
+                    vfs.set_file_contents(vfs_path.clone(), contents);
+                }
+                vfs.file_id(&vfs_path)
             };
             for ws in workspaces.iter() {
                 crate_graph.extend(ws.to_crate_graph(
@@ -249,7 +252,7 @@ impl GlobalState {
                     // Enable flychecks for json projects if a custom flycheck command was supplied
                     // in the workspace configuration.
                     match config {
-                        FlycheckConfig::CustomCommand { .. } => project.path(),
+                        FlycheckConfig::CustomCommand { .. } => Some(project.path()),
                         _ => None,
                     }
                 }