Fix import strategy of macro_use and its test

crates/ra_hir/src/marks.rs

@@ -11,4 +11,5 @@ test_utils::marks!(
     match_ergonomics_ref
     trait_resolution_on_fn_type
     infer_while_let
+    macro_rules_from_other_crates_are_visible_with_macro_use
 );

crates/ra_hir/src/nameres.rs

@@ -101,6 +101,8 @@ pub struct CrateDefMap {
     /// However, do we want to put it as a global variable?
     poison_macros: FxHashSet<MacroDefId>,
 
+    exported_macros: FxHashMap<Name, MacroDefId>,
+
     diagnostics: Vec<DefDiagnostic>,
 }
 
@@ -245,6 +247,7 @@ impl CrateDefMap {
                 root,
                 modules,
                 poison_macros: FxHashSet::default(),
+                exported_macros: FxHashMap::default(),
                 diagnostics: Vec::new(),
             }
         };

crates/ra_hir/src/nameres/collector.rs

@@ -157,6 +157,10 @@ where
         // crate root, even if the parent modules is **not** visible.
         if export {
             self.update(self.def_map.root, None, &[(name.clone(), def.clone())]);
+
+            // Exported macros are collected in crate level ready for
+            // glob import with `#[macro_use]`.
+            self.def_map.exported_macros.insert(name.clone(), macro_id);
         }
         self.update(module_id, None, &[(name.clone(), def)]);
         self.global_macro_scope.insert(name, macro_id);
@@ -295,20 +299,18 @@ where
                         }
                     }
 
-                    // `#[macro_use] extern crate` glob import macros
+                    // `#[macro_use] extern crate` glob imports all macros exported,
+                    // ignoring their scopes
                     if import.is_extern_crate && import.is_macro_use {
                         if let Some(ModuleDef::Module(m)) =
                             def.a().and_then(|item| item.take_types())
                         {
-                            let item_map = self.db.crate_def_map(m.krate);
+                            tested_by!(macro_rules_from_other_crates_are_visible_with_macro_use);
-                            let scope = &item_map[m.module_id].scope;
-                            let macros = scope
-                                .macros
-                                .iter()
-                                .map(|(name, res)| (name.clone(), Either::B(*res)))
-                                .collect::<Vec<_>>();
 
-                            self.update(module_id, Some(import_id), &macros);
+                            let item_map = self.db.crate_def_map(m.krate);
+                            for (name, &macro_id) in &item_map.exported_macros {
+                                self.define_macro(module_id, name.clone(), macro_id, false);
+                            }
                         }
                     }
 
@@ -877,6 +879,7 @@ mod tests {
                 root,
                 modules,
                 poison_macros: FxHashSet::default(),
+                exported_macros: FxHashMap::default(),
                 diagnostics: Vec::new(),
             }
         };

crates/ra_hir/src/nameres/tests/macros.rs

@@ -140,6 +140,7 @@ fn unexpanded_macro_should_expand_by_fixedpoint_loop() {
 
 #[test]
 fn macro_rules_from_other_crates_are_visible_with_macro_use() {
+    covers!(macro_rules_from_other_crates_are_visible_with_macro_use);
     let map = def_map_with_crate_graph(
         "
         //- /main.rs
@@ -160,6 +161,13 @@ fn macro_rules_from_other_crates_are_visible_with_macro_use() {
                 $(struct $i { field: u32 } )*
             }
         }
+
+        mod priv_mod {
+            #[macro_export]
+            macro_rules! baz {
+                () => {};
+            }
+        }
         ",
         crate_graph! {
             "main": ("/main.rs", ["foo"]),
@@ -171,6 +179,7 @@ fn macro_rules_from_other_crates_are_visible_with_macro_use() {
    ⋮Bar: t v
    ⋮Foo: t v
    ⋮bar: t
+   ⋮baz: m
    ⋮foo: t
    ⋮structs: m
    ⋮
@@ -178,6 +187,7 @@ fn macro_rules_from_other_crates_are_visible_with_macro_use() {
    ⋮Bar: t v
    ⋮Foo: t v
    ⋮bar: t
+   ⋮baz: m
    ⋮foo: t
    ⋮structs: m
     "###);