diff --git a/crates/rust-analyzer/src/document.rs b/crates/rust-analyzer/src/document.rs
new file mode 100644
index 0000000000..43219e6330
--- /dev/null
+++ b/crates/rust-analyzer/src/document.rs
@@ -0,0 +1,16 @@
+//! In-memory document information.
+
+/// Information about a document that the Language Client
+// knows about.
+// Its lifetime is driven by the textDocument/didOpen and textDocument/didClose
+// client notifications.
+#[derive(Debug, Clone)]
+pub(crate) struct DocumentData {
+    pub version: Option<i64>,
+}
+
+impl DocumentData {
+    pub fn new(version: i64) -> Self {
+        DocumentData { version: Some(version) }
+    }
+}
diff --git a/crates/rust-analyzer/src/global_state.rs b/crates/rust-analyzer/src/global_state.rs
index 80937dbc4d..b2d65a6d18 100644
--- a/crates/rust-analyzer/src/global_state.rs
+++ b/crates/rust-analyzer/src/global_state.rs
@@ -17,6 +17,7 @@ use rustc_hash::FxHashMap;
 use crate::{
     config::Config,
     diagnostics::{CheckFixes, DiagnosticCollection},
+    document::DocumentData,
     from_proto,
     line_endings::LineEndings,
     main_loop::Task,
@@ -69,7 +70,7 @@ pub(crate) struct GlobalState {
     pub(crate) config: Config,
     pub(crate) analysis_host: AnalysisHost,
     pub(crate) diagnostics: DiagnosticCollection,
-    pub(crate) mem_docs: FxHashMap<VfsPath, Option<i64>>,
+    pub(crate) mem_docs: FxHashMap<VfsPath, DocumentData>,
     pub(crate) vfs: Arc<RwLock<(vfs::Vfs, FxHashMap<FileId, LineEndings>)>>,
     pub(crate) status: Status,
     pub(crate) source_root_config: SourceRootConfig,
@@ -84,7 +85,7 @@ pub(crate) struct GlobalStateSnapshot {
     pub(crate) analysis: Analysis,
     pub(crate) check_fixes: CheckFixes,
     pub(crate) latest_requests: Arc<RwLock<LatestRequests>>,
-    mem_docs: FxHashMap<VfsPath, Option<i64>>,
+    mem_docs: FxHashMap<VfsPath, DocumentData>,
     vfs: Arc<RwLock<(vfs::Vfs, FxHashMap<FileId, LineEndings>)>>,
     pub(crate) workspaces: Arc<Vec<ProjectWorkspace>>,
 }
@@ -259,7 +260,7 @@ impl GlobalStateSnapshot {
 
     pub(crate) fn url_file_version(&self, url: &Url) -> Option<i64> {
         let path = from_proto::vfs_path(&url).ok()?;
-        self.mem_docs.get(&path).copied()?
+        self.mem_docs.get(&path)?.version
     }
 
     pub(crate) fn anchored_path(&self, file_id: FileId, path: &str) -> Url {
diff --git a/crates/rust-analyzer/src/lib.rs b/crates/rust-analyzer/src/lib.rs
index 369830973a..c4284556ed 100644
--- a/crates/rust-analyzer/src/lib.rs
+++ b/crates/rust-analyzer/src/lib.rs
@@ -33,6 +33,7 @@ mod line_endings;
 mod request_metrics;
 mod lsp_utils;
 mod thread_pool;
+mod document;
 pub mod lsp_ext;
 pub mod config;
 
diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index e95d4157c0..51626fcd58 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -15,6 +15,7 @@ use ra_prof::profile;
 use crate::{
     config::Config,
     dispatch::{NotificationDispatcher, RequestDispatcher},
+    document::DocumentData,
     from_proto,
     global_state::{file_id_to_url, url_to_file_id, GlobalState, Status},
     handlers, lsp_ext,
@@ -311,7 +312,7 @@ impl GlobalState {
                 let url = file_id_to_url(&self.vfs.read().0, file_id);
                 let diagnostics = self.diagnostics.diagnostics_for(file_id).cloned().collect();
                 let version = from_proto::vfs_path(&url)
-                    .map(|path| self.mem_docs.get(&path).copied().flatten())
+                    .map(|path| self.mem_docs.get(&path)?.version)
                     .unwrap_or_default();
 
                 self.send_notification::<lsp_types::notification::PublishDiagnostics>(
@@ -406,7 +407,7 @@ impl GlobalState {
                 if let Ok(path) = from_proto::vfs_path(&params.text_document.uri) {
                     if this
                         .mem_docs
-                        .insert(path.clone(), Some(params.text_document.version))
+                        .insert(path.clone(), DocumentData::new(params.text_document.version))
                         .is_some()
                     {
                         log::error!("duplicate DidOpenTextDocument: {}", path)
@@ -428,7 +429,7 @@ impl GlobalState {
 
                     // The version passed in DidChangeTextDocument is the version after all edits are applied
                     // so we should apply it before the vfs is notified.
-                    *doc = params.text_document.version;
+                    doc.version = params.text_document.version;
 
                     vfs.set_file_contents(path.clone(), Some(text.into_bytes()));
                 }
@@ -438,7 +439,7 @@ impl GlobalState {
                 let mut version = None;
                 if let Ok(path) = from_proto::vfs_path(&params.text_document.uri) {
                     match this.mem_docs.remove(&path) {
-                        Some(entry) => version = entry,
+                        Some(doc) => version = doc.version,
                         None => log::error!("orphan DidCloseTextDocument: {}", path),
                     }