6 files changed, 70 insertions, 29 deletions

diff --git a/crates/ra_hir/src/code_model_api.rs b/crates/ra_hir/src/code_model_api.rs
index 46455bd83..87d81f4a4 100644
--- a/crates/ra_hir/src/code_model_api.rs
+++ b/crates/ra_hir/src/code_model_api.rs
@@ -4,7 +4,7 @@ use ra_db::{CrateId, SourceRootId, Edition};
 use ra_syntax::{ast::self, TreeArc};
 
 use crate::{
-    Name, ScopesWithSourceMap, Ty, HirFileId,
+    Name, ScopesWithSourceMap, Ty, HirFileId, ImportSource,
     HirDatabase, DefDatabase,
     type_ref::TypeRef,
     nameres::{ModuleScope, Namespace, ImportId, CrateModuleId},
@@ -117,7 +117,7 @@ impl Module {
     }
 
     /// Returns the syntax of the last path segment corresponding to this import
-    pub fn import_source(&self, db: &impl HirDatabase, import: ImportId) -> TreeArc<ast::UseTree> {
+    pub fn import_source(&self, db: &impl HirDatabase, import: ImportId) -> ImportSource {
         self.import_source_impl(db, import)
     }
 
diff --git a/crates/ra_hir/src/code_model_impl/module.rs b/crates/ra_hir/src/code_model_impl/module.rs
index ccca2b7e5..88dee3a69 100644
--- a/crates/ra_hir/src/code_model_impl/module.rs
+++ b/crates/ra_hir/src/code_model_impl/module.rs
@@ -5,7 +5,7 @@ use crate::{
     Module, ModuleSource, Name, AstId,
     nameres::{CrateModuleId, ImportId},
     HirDatabase, DefDatabase,
-    HirFileId,
+    HirFileId, ImportSource,
 };
 
 impl ModuleSource {
@@ -72,7 +72,7 @@ impl Module {
         &self,
         db: &impl HirDatabase,
         import: ImportId,
-    ) -> TreeArc<ast::UseTree> {
+    ) -> ImportSource {
         let (file_id, source) = self.definition_source(db);
         let (_, source_map) = db.raw_items_with_source_map(file_id);
         source_map.get(&source, import)
diff --git a/crates/ra_hir/src/lib.rs b/crates/ra_hir/src/lib.rs
index 7c603bbd3..643bee6cd 100644
--- a/crates/ra_hir/src/lib.rs
+++ b/crates/ra_hir/src/lib.rs
@@ -56,7 +56,7 @@ pub use self::{
     name::Name,
     source_id::{AstIdMap, ErasedFileAstId},
     ids::{HirFileId, MacroDefId, MacroCallId, MacroCallLoc, HirInterner},
-    nameres::{PerNs, Namespace},
+    nameres::{PerNs, Namespace, ImportId, ImportSource},
     ty::{Ty, ApplicationTy, TypeCtor, Substs, display::HirDisplay},
     impl_block::{ImplBlock, ImplItem},
     docs::{Docs, Documentation},
diff --git a/crates/ra_hir/src/nameres.rs b/crates/ra_hir/src/nameres.rs
index 67b9d6986..6f049acfc 100644
--- a/crates/ra_hir/src/nameres.rs
+++ b/crates/ra_hir/src/nameres.rs
@@ -70,9 +70,12 @@ use crate::{
     AstId,
 };
 
-pub(crate) use self::raw::{RawItems, ImportId, ImportSourceMap};
+pub(crate) use self::raw::{RawItems, ImportSourceMap};
 
-pub use self::per_ns::{PerNs, Namespace};
+pub use self::{
+    per_ns::{PerNs, Namespace},
+    raw::{ImportId, ImportSource},
+};
 
 /// Contans all top-level defs from a macro-expanded crate
 #[derive(Debug, PartialEq, Eq)]
diff --git a/crates/ra_hir/src/nameres/raw.rs b/crates/ra_hir/src/nameres/raw.rs
index 35cbe6655..b7416ede6 100644
--- a/crates/ra_hir/src/nameres/raw.rs
+++ b/crates/ra_hir/src/nameres/raw.rs
@@ -31,21 +31,43 @@ pub struct RawItems {
 
 #[derive(Debug, Default, PartialEq, Eq)]
 pub struct ImportSourceMap {
-    map: ArenaMap<ImportId, AstPtr<ast::UseTree>>,
+    map: ArenaMap<ImportId, ImportSourcePtr>,
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+enum ImportSourcePtr {
+    UseTree(AstPtr<ast::UseTree>),
+    ExternCrate(AstPtr<ast::ExternCrateItem>),
+}
+
+impl ImportSourcePtr {
+    fn to_node(self, file: &SourceFile) -> ImportSource {
+        match self {
+            ImportSourcePtr::UseTree(ptr) => ImportSource::UseTree(ptr.to_node(file).to_owned()),
+            ImportSourcePtr::ExternCrate(ptr) => {
+                ImportSource::ExternCrate(ptr.to_node(file).to_owned())
+            }
+        }
+    }
+}
+
+pub enum ImportSource {
+    UseTree(TreeArc<ast::UseTree>),
+    ExternCrate(TreeArc<ast::ExternCrateItem>),
 }
 
 impl ImportSourceMap {
-    fn insert(&mut self, import: ImportId, use_tree: &ast::UseTree) {
-        self.map.insert(import, AstPtr::new(use_tree))
+    fn insert(&mut self, import: ImportId, ptr: ImportSourcePtr) {
+        self.map.insert(import, ptr)
     }
 
-    pub(crate) fn get(&self, source: &ModuleSource, import: ImportId) -> TreeArc<ast::UseTree> {
+    pub(crate) fn get(&self, source: &ModuleSource, import: ImportId) -> ImportSource {
         let file = match source {
             ModuleSource::SourceFile(file) => &*file,
             ModuleSource::Module(m) => m.syntax().ancestors().find_map(SourceFile::cast).unwrap(),
         };
 
-        self.map[import].to_node(file).to_owned()
+        self.map[import].to_node(file)
     }
 }
 
@@ -257,15 +279,13 @@ impl RawItemsCollector {
         let is_prelude = use_item.has_atom_attr("prelude_import");
 
         Path::expand_use_item(use_item, |path, use_tree, is_glob, alias| {
-            let import = self.raw_items.imports.alloc(ImportData {
-                path,
-                alias,
-                is_glob,
-                is_prelude,
-                is_extern_crate: false,
-            });
-            self.source_map.insert(import, use_tree);
-            self.push_item(current_module, RawItem::Import(import))
+            let import_data =
+                ImportData { path, alias, is_glob, is_prelude, is_extern_crate: false };
+            self.push_import(
+                current_module,
+                import_data,
+                ImportSourcePtr::UseTree(AstPtr::new(use_tree)),
+            );
         })
     }
 
@@ -277,14 +297,18 @@ impl RawItemsCollector {
         if let Some(name_ref) = extern_crate.name_ref() {
             let path = Path::from_name_ref(name_ref);
             let alias = extern_crate.alias().and_then(|a| a.name()).map(AsName::as_name);
-            let import = self.raw_items.imports.alloc(ImportData {
+            let import_data = ImportData {
                 path,
                 alias,
                 is_glob: false,
                 is_prelude: false,
                 is_extern_crate: true,
-            });
-            self.push_item(current_module, RawItem::Import(import))
+            };
+            self.push_import(
+                current_module,
+                import_data,
+                ImportSourcePtr::ExternCrate(AstPtr::new(extern_crate)),
+            );
         }
     }
 
@@ -301,6 +325,17 @@ impl RawItemsCollector {
         self.push_item(current_module, RawItem::Macro(m));
     }
 
+    fn push_import(
+        &mut self,
+        current_module: Option<Module>,
+        data: ImportData,
+        source: ImportSourcePtr,
+    ) {
+        let import = self.raw_items.imports.alloc(data);
+        self.source_map.insert(import, source);
+        self.push_item(current_module, RawItem::Import(import))
+    }
+
     fn push_item(&mut self, current_module: Option<Module>, item: RawItem) {
         match current_module {
             Some(module) => match &mut self.raw_items.modules[module] {
diff --git a/crates/ra_ide_api/src/completion/complete_path.rs b/crates/ra_ide_api/src/completion/complete_path.rs
index 122dd7bdd..e54fe7b7e 100644
--- a/crates/ra_ide_api/src/completion/complete_path.rs
+++ b/crates/ra_ide_api/src/completion/complete_path.rs
@@ -19,11 +19,14 @@ pub(super) fn complete_path(acc: &mut Completions, ctx: &CompletionContext) {
             for (name, res) in module_scope.entries() {
                 if Some(module) == ctx.module {
                     if let Some(import) = res.import {
-                        let path = module.import_source(ctx.db, import);
-                        if path.syntax().range().contains_inclusive(ctx.offset) {
-                            // for `use self::foo<|>`, don't suggest `foo` as a completion
-                            tested_by!(dont_complete_current_use);
-                            continue;
+                        if let hir::ImportSource::UseTree(tree) =
+                            module.import_source(ctx.db, import)
+                        {
+                            if tree.syntax().range().contains_inclusive(ctx.offset) {
+                                // for `use self::foo<|>`, don't suggest `foo` as a completion
+                                tested_by!(dont_complete_current_use);
+                                continue;
+                            }
                         }
                     }
                 }