diff --git a/crates/ra_vfs/src/io.rs b/crates/ra_vfs/src/io/mod.rs
similarity index 97%
rename from crates/ra_vfs/src/io.rs
rename to crates/ra_vfs/src/io/mod.rs
index a74222c02e..6d5af76904 100644
--- a/crates/ra_vfs/src/io.rs
+++ b/crates/ra_vfs/src/io/mod.rs
@@ -11,10 +11,11 @@ use relative_path::RelativePathBuf;
 use thread_worker::WorkerHandle;
 use walkdir::{DirEntry, WalkDir};
 
-use crate::{
-    watcher::{Watcher, WatcherChange},
-    VfsRoot,
-};
+mod watcher;
+use watcher::Watcher;
+pub use watcher::WatcherChange;
+
+use crate::VfsRoot;
 
 pub(crate) enum Task {
     AddRoot {
@@ -22,6 +23,7 @@ pub(crate) enum Task {
         path: PathBuf,
         filter: Box<Fn(&DirEntry) -> bool + Send>,
     },
+    /// this variant should only be created by the watcher
     HandleChange(WatcherChange),
     LoadChange(WatcherChange),
     Watch {
diff --git a/crates/ra_vfs/src/watcher.rs b/crates/ra_vfs/src/io/watcher.rs
similarity index 100%
rename from crates/ra_vfs/src/watcher.rs
rename to crates/ra_vfs/src/io/watcher.rs
index 6069358913..e332984772 100644
--- a/crates/ra_vfs/src/watcher.rs
+++ b/crates/ra_vfs/src/io/watcher.rs
@@ -10,13 +10,6 @@ use std::{
 };
 use walkdir::{DirEntry, WalkDir};
 
-pub(crate) struct Watcher {
-    watcher: RecommendedWatcher,
-    thread: thread::JoinHandle<()>,
-    bomb: DropBomb,
-    sender: Sender<io::Task>,
-}
-
 #[derive(Debug)]
 pub enum WatcherChange {
     Create(PathBuf),
@@ -61,6 +54,13 @@ fn handle_change_event(
 
 const WATCHER_DELAY: Duration = Duration::from_millis(250);
 
+pub(crate) struct Watcher {
+    watcher: RecommendedWatcher,
+    thread: thread::JoinHandle<()>,
+    bomb: DropBomb,
+    sender: Sender<io::Task>,
+}
+
 impl Watcher {
     pub(crate) fn start(
         output_sender: Sender<io::Task>,
diff --git a/crates/ra_vfs/src/lib.rs b/crates/ra_vfs/src/lib.rs
index 1961808904..5db0d86460 100644
--- a/crates/ra_vfs/src/lib.rs
+++ b/crates/ra_vfs/src/lib.rs
@@ -14,7 +14,6 @@
 //! which are watched for changes. Typically, there will be a root for each
 //! Cargo package.
 mod io;
-mod watcher;
 
 use std::{
     cmp::Reverse,
@@ -32,7 +31,7 @@ use rustc_hash::{FxHashMap, FxHashSet};
 use walkdir::DirEntry;
 
 pub use crate::io::TaskResult as VfsTask;
-pub use crate::watcher::WatcherChange;
+use io::{Task, TaskResult, WatcherChange, WatcherChangeData, Worker};
 
 /// `RootFilter` is a predicate that checks if a file can belong to a root. If
 /// several filters match a file (nested dirs), the most nested one wins.
@@ -100,7 +99,7 @@ pub struct Vfs {
     files: Arena<VfsFile, VfsFileData>,
     root2files: FxHashMap<VfsRoot, FxHashSet<VfsFile>>,
     pending_changes: Vec<VfsChange>,
-    worker: io::Worker,
+    worker: Worker,
 }
 
 impl fmt::Debug for Vfs {
@@ -204,7 +203,7 @@ impl Vfs {
 
     pub fn handle_task(&mut self, task: io::TaskResult) {
         match task {
-            io::TaskResult::AddRoot(task) => {
+            TaskResult::AddRoot(task) => {
                 let mut files = Vec::new();
                 // While we were scanning the root in the backgound, a file might have
                 // been open in the editor, so we need to account for that.
@@ -229,38 +228,35 @@ impl Vfs {
                 };
                 self.pending_changes.push(change);
             }
-            io::TaskResult::HandleChange(change) => match &change {
-                watcher::WatcherChange::Create(path) if path.is_dir() => {
+            TaskResult::HandleChange(change) => match &change {
+                WatcherChange::Create(path) if path.is_dir() => {
                     if let Some((root, _path, _file)) = self.find_root(&path) {
                         let root_filter = self.roots[root].clone();
                         let filter =
                             move |entry: &DirEntry| root_filter.can_contain(entry.path()).is_some();
                         self.worker
                             .sender()
-                            .send(io::Task::Watch {
+                            .send(Task::Watch {
                                 dir: path.to_path_buf(),
                                 filter: Box::new(filter),
                             })
                             .unwrap()
                     }
                 }
-                watcher::WatcherChange::Create(path)
-                | watcher::WatcherChange::Remove(path)
-                | watcher::WatcherChange::Write(path) => {
+                WatcherChange::Create(path)
+                | WatcherChange::Remove(path)
+                | WatcherChange::Write(path) => {
                     if self.should_handle_change(&path) {
-                        self.worker
-                            .sender()
-                            .send(io::Task::LoadChange(change))
-                            .unwrap()
+                        self.worker.sender().send(Task::LoadChange(change)).unwrap()
                     }
                 }
-                watcher::WatcherChange::Rescan => {
+                WatcherChange::Rescan => {
                     // TODO we should reload all files
                 }
             },
-            io::TaskResult::LoadChange(change) => match change {
-                io::WatcherChangeData::Create { path, text }
-                | io::WatcherChangeData::Write { path, text } => {
+            TaskResult::LoadChange(change) => match change {
+                WatcherChangeData::Create { path, text }
+                | WatcherChangeData::Write { path, text } => {
                     if let Some((root, path, file)) = self.find_root(&path) {
                         if let Some(file) = file {
                             self.do_change_file(file, text, false);
@@ -269,7 +265,7 @@ impl Vfs {
                         }
                     }
                 }
-                io::WatcherChangeData::Remove { path } => {
+                WatcherChangeData::Remove { path } => {
                     if let Some((root, path, file)) = self.find_root(&path) {
                         if let Some(file) = file {
                             self.do_remove_file(root, path, file, false);
@@ -277,7 +273,7 @@ impl Vfs {
                     }
                 }
             },
-            io::TaskResult::NoOp => {}
+            TaskResult::NoOp => {}
         }
     }