6 files changed, 28 insertions, 31 deletions

diff --git a/crates/ra_hir/src/code_model_impl/krate.rs b/crates/ra_hir/src/code_model_impl/krate.rs
index 3275eafed..712c6c86a 100644
--- a/crates/ra_hir/src/code_model_impl/krate.rs
+++ b/crates/ra_hir/src/code_model_impl/krate.rs
@@ -25,7 +25,7 @@ impl Crate {
         let file_id = crate_graph.crate_root(self.crate_id);
         let source_root_id = db.file_source_root(file_id);
         let file_id = HirFileId::from(file_id);
-        let module_tree = db.module_tree(source_root_id)?;
+        let module_tree = db.module_tree(source_root_id);
         // FIXME: teach module tree about crate roots instead of guessing
         let source = SourceItemId {
             file_id,
diff --git a/crates/ra_hir/src/code_model_impl/module.rs b/crates/ra_hir/src/code_model_impl/module.rs
index 775dd6709..2ec3ab469 100644
--- a/crates/ra_hir/src/code_model_impl/module.rs
+++ b/crates/ra_hir/src/code_model_impl/module.rs
@@ -19,7 +19,7 @@ impl Module {
         source_root_id: SourceRootId,
         module_id: ModuleId,
     ) -> Cancelable<Self> {
-        let module_tree = db.module_tree(source_root_id)?;
+        let module_tree = db.module_tree(source_root_id);
         let def_loc = DefLoc {
             kind: DefKind::Module,
             source_root_id,
@@ -33,7 +33,7 @@ impl Module {
 
     pub(crate) fn name_impl(&self, db: &impl HirDatabase) -> Cancelable<Option<Name>> {
         let loc = self.def_id.loc(db);
-        let module_tree = db.module_tree(loc.source_root_id)?;
+        let module_tree = db.module_tree(loc.source_root_id);
         let link = ctry!(loc.module_id.parent_link(&module_tree));
         Ok(Some(link.name(&module_tree).clone()))
     }
@@ -59,7 +59,7 @@ impl Module {
         db: &impl HirDatabase,
     ) -> Cancelable<Option<(FileId, TreeArc<ast::Module>)>> {
         let loc = self.def_id.loc(db);
-        let module_tree = db.module_tree(loc.source_root_id)?;
+        let module_tree = db.module_tree(loc.source_root_id);
         let link = ctry!(loc.module_id.parent_link(&module_tree));
         let file_id = link
             .owner(&module_tree)
@@ -82,7 +82,7 @@ impl Module {
 
     pub(crate) fn crate_root_impl(&self, db: &impl HirDatabase) -> Cancelable<Module> {
         let loc = self.def_id.loc(db);
-        let module_tree = db.module_tree(loc.source_root_id)?;
+        let module_tree = db.module_tree(loc.source_root_id);
         let module_id = loc.module_id.crate_root(&module_tree);
         Module::from_module_id(db, loc.source_root_id, module_id)
     }
@@ -90,7 +90,7 @@ impl Module {
     /// Finds a child module with the specified name.
     pub fn child_impl(&self, db: &impl HirDatabase, name: &Name) -> Cancelable<Option<Module>> {
         let loc = self.def_id.loc(db);
-        let module_tree = db.module_tree(loc.source_root_id)?;
+        let module_tree = db.module_tree(loc.source_root_id);
         let child_id = ctry!(loc.module_id.child(&module_tree, name));
         Module::from_module_id(db, loc.source_root_id, child_id).map(Some)
     }
@@ -101,7 +101,7 @@ impl Module {
         // it's kind of hard since the iterator needs to keep a reference to the
         // module tree.
         let loc = self.def_id.loc(db);
-        let module_tree = db.module_tree(loc.source_root_id)?;
+        let module_tree = db.module_tree(loc.source_root_id);
         let children = loc
             .module_id
             .children(&module_tree)
@@ -112,7 +112,7 @@ impl Module {
 
     pub fn parent_impl(&self, db: &impl HirDatabase) -> Cancelable<Option<Module>> {
         let loc = self.def_id.loc(db);
-        let module_tree = db.module_tree(loc.source_root_id)?;
+        let module_tree = db.module_tree(loc.source_root_id);
         let parent_id = ctry!(loc.module_id.parent(&module_tree));
         Module::from_module_id(db, loc.source_root_id, parent_id).map(Some)
     }
@@ -190,7 +190,7 @@ impl Module {
         db: &impl HirDatabase,
     ) -> Cancelable<Vec<(TreeArc<SyntaxNode>, Problem)>> {
         let loc = self.def_id.loc(db);
-        let module_tree = db.module_tree(loc.source_root_id)?;
+        let module_tree = db.module_tree(loc.source_root_id);
         Ok(loc.module_id.problems(&module_tree, db))
     }
 }
diff --git a/crates/ra_hir/src/db.rs b/crates/ra_hir/src/db.rs
index fd6336dd8..68c3eb4e4 100644
--- a/crates/ra_hir/src/db.rs
+++ b/crates/ra_hir/src/db.rs
@@ -77,7 +77,7 @@ pub trait HirDatabase: SyntaxDatabase
         use fn query_definitions::file_item;
     }
 
-    fn submodules(source: SourceItemId) -> Cancelable<Arc<Vec<crate::module_tree::Submodule>>> {
+    fn submodules(source: SourceItemId) -> Arc<Vec<crate::module_tree::Submodule>> {
         type SubmodulesQuery;
         use fn crate::module_tree::Submodule::submodules_query;
     }
@@ -92,7 +92,7 @@ pub trait HirDatabase: SyntaxDatabase
         use fn query_definitions::item_map;
     }
 
-    fn module_tree(source_root_id: SourceRootId) -> Cancelable<Arc<ModuleTree>> {
+    fn module_tree(source_root_id: SourceRootId) -> Arc<ModuleTree> {
         type ModuleTreeQuery;
         use fn crate::module_tree::ModuleTree::module_tree_query;
     }
diff --git a/crates/ra_hir/src/module_tree.rs b/crates/ra_hir/src/module_tree.rs
index fd5a92c5b..0256d7996 100644
--- a/crates/ra_hir/src/module_tree.rs
+++ b/crates/ra_hir/src/module_tree.rs
@@ -3,7 +3,7 @@ use std::sync::Arc;
 use rustc_hash::{FxHashMap, FxHashSet};
 use arrayvec::ArrayVec;
 use relative_path::RelativePathBuf;
-use ra_db::{FileId, SourceRootId, Cancelable, SourceRoot};
+use ra_db::{FileId, SourceRootId, SourceRoot};
 use ra_syntax::{
     SyntaxNode, TreeArc,
     algo::generate,
@@ -41,7 +41,7 @@ impl Submodule {
     pub(crate) fn submodules_query(
         db: &impl HirDatabase,
         source: SourceItemId,
-    ) -> Cancelable<Arc<Vec<Submodule>>> {
+    ) -> Arc<Vec<Submodule>> {
         db.check_canceled();
         let file_id = source.file_id;
         let file_items = db.file_items(file_id);
@@ -54,7 +54,7 @@ impl Submodule {
                 collect_submodules(file_id, &file_items, module.item_list().unwrap())
             }
         };
-        return Ok(Arc::new(submodules));
+        return Arc::new(submodules);
 
         fn collect_submodules(
             file_id: HirFileId,
@@ -116,10 +116,10 @@ impl ModuleTree {
     pub(crate) fn module_tree_query(
         db: &impl HirDatabase,
         source_root: SourceRootId,
-    ) -> Cancelable<Arc<ModuleTree>> {
+    ) -> Arc<ModuleTree> {
         db.check_canceled();
         let res = create_module_tree(db, source_root);
-        Ok(Arc::new(res?))
+        Arc::new(res)
     }
 
     pub(crate) fn modules<'a>(&'a self) -> impl Iterator<Item = ModuleId> + 'a {
@@ -225,10 +225,7 @@ fn modules(root: &impl ast::ModuleItemOwner) -> impl Iterator<Item = (Name, &ast
         })
 }
 
-fn create_module_tree<'a>(
-    db: &impl HirDatabase,
-    source_root: SourceRootId,
-) -> Cancelable<ModuleTree> {
+fn create_module_tree<'a>(db: &impl HirDatabase, source_root: SourceRootId) -> ModuleTree {
     let mut tree = ModuleTree::default();
 
     let mut roots = FxHashMap::default();
@@ -252,10 +249,10 @@ fn create_module_tree<'a>(
             &mut roots,
             None,
             source,
-        )?;
+        );
         roots.insert(file_id, module_id);
     }
-    Ok(tree)
+    tree
 }
 
 fn build_subtree(
@@ -266,14 +263,14 @@ fn build_subtree(
     roots: &mut FxHashMap<FileId, ModuleId>,
     parent: Option<LinkId>,
     source: SourceItemId,
-) -> Cancelable<ModuleId> {
+) -> ModuleId {
     visited.insert(source);
     let id = tree.push_mod(ModuleData {
         source,
         parent,
         children: Vec::new(),
     });
-    for sub in db.submodules(source)?.iter() {
+    for sub in db.submodules(source).iter() {
         let link = tree.push_link(LinkData {
             source: sub.source,
             name: sub.name.clone(),
@@ -289,7 +286,7 @@ fn build_subtree(
                 .map(|file_id| match roots.remove(&file_id) {
                     Some(module_id) => {
                         tree.mods[module_id].parent = Some(link);
-                        Ok(module_id)
+                        module_id
                     }
                     None => build_subtree(
                         db,
@@ -304,7 +301,7 @@ fn build_subtree(
                         },
                     ),
                 })
-                .collect::<Cancelable<Vec<_>>>()?;
+                .collect::<Vec<_>>();
             (points_to, problem)
         } else {
             let points_to = build_subtree(
@@ -315,14 +312,14 @@ fn build_subtree(
                 roots,
                 Some(link),
                 sub.source,
-            )?;
+            );
             (vec![points_to], None)
         };
 
         tree.links[link].points_to = points_to;
         tree.links[link].problem = problem;
     }
-    Ok(id)
+    id
 }
 
 fn resolve_submodule(
diff --git a/crates/ra_hir/src/query_definitions.rs b/crates/ra_hir/src/query_definitions.rs
index 214a9d68b..d84efbf95 100644
--- a/crates/ra_hir/src/query_definitions.rs
+++ b/crates/ra_hir/src/query_definitions.rs
@@ -48,7 +48,7 @@ pub(super) fn input_module_items(
     source_root_id: SourceRootId,
     module_id: ModuleId,
 ) -> Cancelable<Arc<InputModuleItems>> {
-    let module_tree = db.module_tree(source_root_id)?;
+    let module_tree = db.module_tree(source_root_id);
     let source = module_id.source(&module_tree);
     let file_id = source.file_id;
     let source = ModuleSource::from_source_item_id(db, source);
@@ -98,7 +98,7 @@ pub(super) fn item_map(
     source_root: SourceRootId,
 ) -> Cancelable<Arc<ItemMap>> {
     let start = Instant::now();
-    let module_tree = db.module_tree(source_root)?;
+    let module_tree = db.module_tree(source_root);
     let input = module_tree
         .modules()
         .map(|id| {
diff --git a/crates/ra_hir/src/source_binder.rs b/crates/ra_hir/src/source_binder.rs
index 1f149a366..70dd850d7 100644
--- a/crates/ra_hir/src/source_binder.rs
+++ b/crates/ra_hir/src/source_binder.rs
@@ -92,7 +92,7 @@ pub fn module_from_child_node(
 
 fn module_from_source(db: &impl HirDatabase, source: SourceItemId) -> Cancelable<Option<Module>> {
     let source_root_id = db.file_source_root(source.file_id.as_original_file());
-    let module_tree = db.module_tree(source_root_id)?;
+    let module_tree = db.module_tree(source_root_id);
     let module_id = ctry!(module_tree.find_module_by_source(source));
     Ok(Some(Module::from_module_id(db, source_root_id, module_id)?))
 }