Add highlighting of items from other crates

crates/hir/src/lib.rs

@@ -673,6 +673,11 @@ impl Variant {
     pub fn module(self, db: &dyn HirDatabase) -> Module {
         self.parent.module(db)
     }
+
+    pub fn krate(self, db: &dyn HirDatabase) -> Crate {
+        self.module(db).krate()
+    }
+
     pub fn parent_enum(self, _db: &dyn HirDatabase) -> Enum {
         self.parent
     }
@@ -767,6 +772,10 @@ impl VariantDef {
         }
     }
 
+    pub fn krate(self, db: &dyn HirDatabase) -> Crate {
+        self.module(db).krate()
+    }
+
     pub fn name(&self, db: &dyn HirDatabase) -> Name {
         match self {
             VariantDef::Struct(s) => s.name(db),
@@ -1074,6 +1083,10 @@ impl Trait {
         Module { id: self.id.lookup(db.upcast()).container }
     }
 
+    pub fn krate(self, db: &dyn HirDatabase) -> Crate {
+        self.module(db).krate()
+    }
+
     pub fn name(self, db: &dyn HirDatabase) -> Name {
         db.trait_data(self.id).name.clone()
     }
@@ -1178,6 +1191,10 @@ impl MacroDef {
         Some(Module { id: def_map.module_id(module_id) })
     }
 
+    pub fn krate(self, db: &dyn HirDatabase) -> Option<Crate> {
+        self.module(db).map(Module::krate)
+    }
+
     /// XXX: this parses the file
     pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
         match self.source(db)?.value {