fix completion bugs

crates/ra_hir/src/code_model_impl/module.rs

@@ -143,6 +143,10 @@ impl Module {
                         return PerNs::none();
                     }
                 }
+                PathKind::Abs => {
+                    // TODO: absolute use is not supported
+                    return PerNs::none();
+                }
             }
             .def_id,
         );

crates/ra_hir/src/nameres.rs

@@ -15,7 +15,8 @@
 //! so that the results of name resolution can be preserved unless the module
 //! structure itself is modified.
 pub(crate) mod lower;
-use lower::*;
+
+use crate::nameres::lower::*;
 
 use std::sync::Arc;
 
@@ -59,7 +60,7 @@ impl ModuleScope {
 pub struct Resolution {
     /// None for unresolved
     pub def_id: PerNs<DefId>,
-    /// ident by whitch this is imported into local scope.
+    /// ident by which this is imported into local scope.
     pub import: Option<ImportId>,
 }
 
@@ -317,6 +318,10 @@ where
                 }
             }
             PathKind::Crate => module_id.crate_root(&self.module_tree),
+            PathKind::Abs => {
+                // TODO: absolute use is not supported for now
+                return false;
+            }
         };
 
         for (i, segment) in import.path.segments.iter().enumerate() {

crates/ra_hir/src/path.rs

@@ -38,6 +38,8 @@ pub enum PathKind {
     Self_,
     Super,
     Crate,
+    // Absolute path
+    Abs,
 }
 
 impl Path {
@@ -57,6 +59,11 @@ impl Path {
         let mut segments = Vec::new();
         loop {
             let segment = path.segment()?;
+
+            if segment.has_colon_colon() {
+                kind = PathKind::Abs;
+            }
+
             match segment.kind()? {
                 ast::PathSegmentKind::Name(name) => {
                     let args = segment