5 files changed, 265 insertions, 141 deletions

diff --git a/crates/ra_hir/src/nameres/collector.rs b/crates/ra_hir/src/nameres/collector.rs
index 09cda7656..03fbbd33f 100644
--- a/crates/ra_hir/src/nameres/collector.rs
+++ b/crates/ra_hir/src/nameres/collector.rs
@@ -5,14 +5,13 @@ use test_utils::tested_by;
 
 use crate::{
     db::DefDatabase,
-    either::Either,
     ids::{AstItemDef, LocationCtx, MacroCallId, MacroCallLoc, MacroDefId, MacroFileKind},
     name::MACRO_RULES,
     nameres::{
         diagnostics::DefDiagnostic,
         mod_resolution::{resolve_submodule, ParentModule},
-        raw, CrateDefMap, CrateModuleId, ItemOrMacro, ModuleData, ModuleDef, PerNs,
-        ReachedFixedPoint, Resolution, ResolveMode,
+        raw, Crate, CrateDefMap, CrateModuleId, ModuleData, ModuleDef, PerNs, ReachedFixedPoint,
+        Resolution, ResolveMode,
     },
     AstId, Const, Enum, Function, HirFileId, MacroDef, Module, Name, Path, PathKind, Static,
     Struct, Trait, TypeAlias, Union,
@@ -123,30 +122,51 @@ where
         let unresolved_imports = std::mem::replace(&mut self.unresolved_imports, Vec::new());
         // show unresolved imports in completion, etc
         for (module_id, import, import_data) in unresolved_imports {
-            self.record_resolved_import(module_id, Either::A(PerNs::none()), import, &import_data)
+            self.record_resolved_import(module_id, PerNs::none(), import, &import_data)
         }
     }
 
+    /// Define a macro with `macro_rules`.
+    ///
+    /// It will define the macro in legacy textual scope, and if it has `#[macro_export]`,
+    /// then it is also defined in the root module scope.
+    /// You can `use` or invoke it by `crate::macro_name` anywhere, before or after the definition.
+    ///
+    /// It is surprising that the macro will never be in the current module scope.
+    /// These code fails with "unresolved import/macro",
+    /// ```rust,compile_fail
+    /// mod m { macro_rules! foo { () => {} } }
+    /// use m::foo as bar;
+    /// ```
+    ///
+    /// ```rust,compile_fail
+    /// macro_rules! foo { () => {} }
+    /// self::foo!();
+    /// crate::foo!();
+    /// ```
+    ///
+    /// Well, this code compiles, bacause the plain path `foo` in `use` is searched
+    /// in the legacy textual scope only.
+    /// ```rust
+    /// macro_rules! foo { () => {} }
+    /// use foo as bar;
+    /// ```
     fn define_macro(
         &mut self,
         module_id: CrateModuleId,
         name: Name,
-        macro_id: MacroDefId,
+        macro_: MacroDef,
         export: bool,
     ) {
-        let def = Either::B(MacroDef { id: macro_id });
+        // Textual scoping
+        self.define_legacy_macro(module_id, name.clone(), macro_);
 
+        // Module scoping
         // In Rust, `#[macro_export]` macros are unconditionally visible at the
         // 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(self.def_map.root, None, &[(name.clone(), Resolution::from_macro(macro_))]);
         }
-        self.update(module_id, None, &[(name.clone(), def)]);
-        self.define_legacy_macro(module_id, name.clone(), macro_id);
     }
 
     /// Define a legacy textual scoped macro in module
@@ -156,14 +176,12 @@ where
     /// the definition of current module.
     /// And also, `macro_use` on a module will import all legacy macros visable inside to
     /// current legacy scope, with possible shadowing.
-    fn define_legacy_macro(&mut self, module_id: CrateModuleId, name: Name, macro_id: MacroDefId) {
+    fn define_legacy_macro(&mut self, module_id: CrateModuleId, name: Name, macro_: MacroDef) {
         // Always shadowing
-        self.def_map.modules[module_id].scope.legacy_macros.insert(name, MacroDef { id: macro_id });
+        self.def_map.modules[module_id].scope.legacy_macros.insert(name, macro_);
     }
 
     /// Import macros from `#[macro_use] extern crate`.
-    ///
-    /// They are non-scoped, and will only be inserted into mutable `global_macro_scope`.
     fn import_macros_from_extern_crate(
         &mut self,
         current_module_id: CrateModuleId,
@@ -184,14 +202,20 @@ where
 
         if let Some(ModuleDef::Module(m)) = res.take_types() {
             tested_by!(macro_rules_from_other_crates_are_visible_with_macro_use);
-            self.import_all_macros_exported(current_module_id, m);
+            self.import_all_macros_exported(current_module_id, m.krate);
         }
     }
 
-    fn import_all_macros_exported(&mut self, current_module_id: CrateModuleId, module: Module) {
-        let item_map = self.db.crate_def_map(module.krate);
-        for (name, &macro_id) in &item_map.exported_macros {
-            self.define_legacy_macro(current_module_id, name.clone(), macro_id);
+    /// Import all exported macros from another crate
+    ///
+    /// Exported macros are just all macros in the root module scope.
+    /// Note that it contains not only all `#[macro_export]` macros, but also all aliases
+    /// created by `use` in the root module, ignoring the visibility of `use`.
+    fn import_all_macros_exported(&mut self, current_module_id: CrateModuleId, krate: Crate) {
+        let def_map = self.db.crate_def_map(krate);
+        for (name, def) in def_map[def_map.root].scope.macros() {
+            // `macro_use` only bring things into legacy scope.
+            self.define_legacy_macro(current_module_id, name.clone(), def);
         }
     }
 
@@ -219,7 +243,7 @@ where
         &self,
         module_id: CrateModuleId,
         import: &raw::ImportData,
-    ) -> (ItemOrMacro, ReachedFixedPoint) {
+    ) -> (PerNs<ModuleDef>, ReachedFixedPoint) {
         log::debug!("resolving import: {:?} ({:?})", import, self.def_map.edition);
         if import.is_extern_crate {
             let res = self.def_map.resolve_name_in_extern_prelude(
@@ -228,7 +252,7 @@ where
                     .as_ident()
                     .expect("extern crate should have been desugared to one-element path"),
             );
-            (Either::A(res), ReachedFixedPoint::Yes)
+            (res, ReachedFixedPoint::Yes)
         } else {
             let res = self.def_map.resolve_path_fp_with_macro(
                 self.db,
@@ -244,13 +268,13 @@ where
     fn record_resolved_import(
         &mut self,
         module_id: CrateModuleId,
-        def: ItemOrMacro,
+        def: PerNs<ModuleDef>,
         import_id: raw::ImportId,
         import: &raw::ImportData,
     ) {
         if import.is_glob {
             log::debug!("glob import: {:?}", import);
-            match def.a().and_then(|item| item.take_types()) {
+            match def.take_types() {
                 Some(ModuleDef::Module(m)) => {
                     if import.is_prelude {
                         tested_by!(std_prelude);
@@ -260,30 +284,29 @@ where
                         // glob import from other crate => we can just import everything once
                         let item_map = self.db.crate_def_map(m.krate);
                         let scope = &item_map[m.module_id].scope;
+
+                        // Module scoped macros is included
                         let items = scope
                             .items
                             .iter()
-                            .map(|(name, res)| (name.clone(), Either::A(res.clone())));
-                        let macros =
-                            scope.macros.iter().map(|(name, res)| (name.clone(), Either::B(*res)));
+                            .map(|(name, res)| (name.clone(), res.clone()))
+                            .collect::<Vec<_>>();
 
-                        let all = items.chain(macros).collect::<Vec<_>>();
-                        self.update(module_id, Some(import_id), &all);
+                        self.update(module_id, Some(import_id), &items);
                     } else {
                         // glob import from same crate => we do an initial
                         // import, and then need to propagate any further
                         // additions
                         let scope = &self.def_map[m.module_id].scope;
+
+                        // Module scoped macros is included
                         let items = scope
                             .items
                             .iter()
-                            .map(|(name, res)| (name.clone(), Either::A(res.clone())));
-                        let macros =
-                            scope.macros.iter().map(|(name, res)| (name.clone(), Either::B(*res)));
+                            .map(|(name, res)| (name.clone(), res.clone()))
+                            .collect::<Vec<_>>();
 
-                        let all = items.chain(macros).collect::<Vec<_>>();
-
-                        self.update(module_id, Some(import_id), &all);
+                        self.update(module_id, Some(import_id), &items);
                         // record the glob import in case we add further items
                         self.glob_imports
                             .entry(m.module_id)
@@ -303,7 +326,7 @@ where
                                 import: Some(import_id),
                             };
                             let name = variant.name(self.db)?;
-                            Some((name, Either::A(res)))
+                            Some((name, res))
                         })
                         .collect::<Vec<_>>();
                     self.update(module_id, Some(import_id), &resolutions);
@@ -323,18 +346,12 @@ where
 
                     // extern crates in the crate root are special-cased to insert entries into the extern prelude: rust-lang/rust#54658
                     if import.is_extern_crate && module_id == self.def_map.root {
-                        if let Some(def) = def.a().and_then(|item| item.take_types()) {
+                        if let Some(def) = def.take_types() {
                             self.def_map.extern_prelude.insert(name.clone(), def);
                         }
                     }
 
-                    let resolution = match def {
-                        Either::A(item) => {
-                            Either::A(Resolution { def: item, import: Some(import_id) })
-                        }
-                        Either::B(macro_) => Either::B(macro_),
-                    };
-
+                    let resolution = Resolution { def, import: Some(import_id) };
                     self.update(module_id, Some(import_id), &[(name, resolution)]);
                 }
                 None => tested_by!(bogus_paths),
@@ -346,7 +363,7 @@ where
         &mut self,
         module_id: CrateModuleId,
         import: Option<raw::ImportId>,
-        resolutions: &[(Name, Either<Resolution, MacroDef>)],
+        resolutions: &[(Name, Resolution)],
     ) {
         self.update_recursive(module_id, import, resolutions, 0)
     }
@@ -355,7 +372,7 @@ where
         &mut self,
         module_id: CrateModuleId,
         import: Option<raw::ImportId>,
-        resolutions: &[(Name, Either<Resolution, MacroDef>)],
+        resolutions: &[(Name, Resolution)],
         depth: usize,
     ) {
         if depth > 100 {
@@ -365,35 +382,30 @@ where
         let module_items = &mut self.def_map.modules[module_id].scope;
         let mut changed = false;
         for (name, res) in resolutions {
-            match res {
-                // item
-                Either::A(res) => {
-                    let existing = module_items.items.entry(name.clone()).or_default();
-
-                    if existing.def.types.is_none() && res.def.types.is_some() {
-                        existing.def.types = res.def.types;
-                        existing.import = import.or(res.import);
-                        changed = true;
-                    }
-                    if existing.def.values.is_none() && res.def.values.is_some() {
-                        existing.def.values = res.def.values;
-                        existing.import = import.or(res.import);
-                        changed = true;
-                    }
+            let existing = module_items.items.entry(name.clone()).or_default();
 
-                    if existing.def.is_none()
-                        && res.def.is_none()
-                        && existing.import.is_none()
-                        && res.import.is_some()
-                    {
-                        existing.import = res.import;
-                    }
-                }
-                // macro
-                Either::B(res) => {
-                    // Always shadowing
-                    module_items.macros.insert(name.clone(), *res);
-                }
+            if existing.def.types.is_none() && res.def.types.is_some() {
+                existing.def.types = res.def.types;
+                existing.import = import.or(res.import);
+                changed = true;
+            }
+            if existing.def.values.is_none() && res.def.values.is_some() {
+                existing.def.values = res.def.values;
+                existing.import = import.or(res.import);
+                changed = true;
+            }
+            if existing.def.macros.is_none() && res.def.macros.is_some() {
+                existing.def.macros = res.def.macros;
+                existing.import = import.or(res.import);
+                changed = true;
+            }
+
+            if existing.def.is_none()
+                && res.def.is_none()
+                && existing.import.is_none()
+                && res.import.is_some()
+            {
+                existing.import = res.import;
             }
         }
 
@@ -425,7 +437,7 @@ where
                 path,
             );
 
-            if let Some(def) = resolved_res.resolved_def.b() {
+            if let Some(def) = resolved_res.resolved_def.get_macros() {
                 let call_id = MacroCallLoc { def: def.id, ast_id: *ast_id }.id(self.db);
                 resolved.push((*module_id, call_id, def.id));
                 res = ReachedFixedPoint::No;
@@ -528,7 +540,7 @@ where
         if let Some(prelude_module) = self.def_collector.def_map.prelude {
             if prelude_module.krate != self.def_collector.def_map.krate {
                 tested_by!(prelude_is_macro_use);
-                self.def_collector.import_all_macros_exported(self.module_id, prelude_module);
+                self.def_collector.import_all_macros_exported(self.module_id, prelude_module.krate);
             }
         }
 
@@ -636,7 +648,7 @@ where
             ),
             import: None,
         };
-        self.def_collector.update(self.module_id, None, &[(name, Either::A(resolution))]);
+        self.def_collector.update(self.module_id, None, &[(name, resolution)]);
         res
     }
 
@@ -667,7 +679,7 @@ where
             raw::DefKind::TypeAlias(ast_id) => PerNs::types(def!(TypeAlias, ast_id)),
         };
         let resolution = Resolution { def, import: None };
-        self.def_collector.update(self.module_id, None, &[(name, Either::A(resolution))])
+        self.def_collector.update(self.module_id, None, &[(name, resolution)])
     }
 
     fn collect_macro(&mut self, mac: &raw::MacroData) {
@@ -675,7 +687,8 @@ where
         if is_macro_rules(&mac.path) {
             if let Some(name) = &mac.name {
                 let macro_id = MacroDefId(mac.ast_id.with_file_id(self.file_id));
-                self.def_collector.define_macro(self.module_id, name.clone(), macro_id, mac.export)
+                let macro_ = MacroDef { id: macro_id };
+                self.def_collector.define_macro(self.module_id, name.clone(), macro_, mac.export);
             }
             return;
         }
@@ -706,7 +719,7 @@ where
     fn import_all_legacy_macros(&mut self, module_id: CrateModuleId) {
         let macros = self.def_collector.def_map[module_id].scope.legacy_macros.clone();
         for (name, macro_) in macros {
-            self.def_collector.define_legacy_macro(self.module_id, name.clone(), macro_.id);
+            self.def_collector.define_legacy_macro(self.module_id, name.clone(), macro_);
         }
     }
 }
@@ -758,7 +771,6 @@ mod tests {
                 root,
                 modules,
                 poison_macros: FxHashSet::default(),
-                exported_macros: FxHashMap::default(),
                 diagnostics: Vec::new(),
             }
         };
diff --git a/crates/ra_hir/src/nameres/per_ns.rs b/crates/ra_hir/src/nameres/per_ns.rs
index c40a3ff9d..d07cc08f4 100644
--- a/crates/ra_hir/src/nameres/per_ns.rs
+++ b/crates/ra_hir/src/nameres/per_ns.rs
@@ -1,78 +1,87 @@
+use crate::MacroDef;
+
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub enum Namespace {
     Types,
     Values,
+    // Note that only type inference uses this enum, and it doesn't care about macros.
+    // Macro,
 }
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct PerNs<T> {
     pub types: Option<T>,
     pub values: Option<T>,
+    /// Since macros has different type, many methods simply ignore it.
+    /// We can only use special method like `get_macros` to access it.
+    pub macros: Option<MacroDef>,
 }
 
 impl<T> Default for PerNs<T> {
     fn default() -> Self {
-        PerNs { types: None, values: None }
+        PerNs { types: None, values: None, macros: None }
     }
 }
 
 impl<T> PerNs<T> {
     pub fn none() -> PerNs<T> {
-        PerNs { types: None, values: None }
+        PerNs { types: None, values: None, macros: None }
     }
 
     pub fn values(t: T) -> PerNs<T> {
-        PerNs { types: None, values: Some(t) }
+        PerNs { types: None, values: Some(t), macros: None }
     }
 
     pub fn types(t: T) -> PerNs<T> {
-        PerNs { types: Some(t), values: None }
+        PerNs { types: Some(t), values: None, macros: None }
     }
 
     pub fn both(types: T, values: T) -> PerNs<T> {
-        PerNs { types: Some(types), values: Some(values) }
+        PerNs { types: Some(types), values: Some(values), macros: None }
     }
 
-    pub fn is_none(&self) -> bool {
-        self.types.is_none() && self.values.is_none()
+    pub fn macros(macro_: MacroDef) -> PerNs<T> {
+        PerNs { types: None, values: None, macros: Some(macro_) }
     }
 
-    pub fn is_both(&self) -> bool {
-        self.types.is_some() && self.values.is_some()
+    pub fn is_none(&self) -> bool {
+        self.types.is_none() && self.values.is_none() && self.macros.is_none()
     }
 
-    pub fn take(self, namespace: Namespace) -> Option<T> {
-        match namespace {
-            Namespace::Types => self.types,
-            Namespace::Values => self.values,
-        }
+    pub fn is_all(&self) -> bool {
+        self.types.is_some() && self.values.is_some() && self.macros.is_some()
     }
 
     pub fn take_types(self) -> Option<T> {
-        self.take(Namespace::Types)
+        self.types
     }
 
     pub fn take_values(self) -> Option<T> {
-        self.take(Namespace::Values)
+        self.values
     }
 
-    pub fn get(&self, namespace: Namespace) -> Option<&T> {
-        self.as_ref().take(namespace)
+    pub fn get_macros(&self) -> Option<MacroDef> {
+        self.macros
     }
 
-    pub fn as_ref(&self) -> PerNs<&T> {
-        PerNs { types: self.types.as_ref(), values: self.values.as_ref() }
+    pub fn only_macros(&self) -> PerNs<T> {
+        PerNs { types: None, values: None, macros: self.macros }
     }
 
-    pub fn or(self, other: PerNs<T>) -> PerNs<T> {
-        PerNs { types: self.types.or(other.types), values: self.values.or(other.values) }
+    pub fn as_ref(&self) -> PerNs<&T> {
+        PerNs { types: self.types.as_ref(), values: self.values.as_ref(), macros: self.macros }
     }
 
-    pub fn and_then<U>(self, f: impl Fn(T) -> Option<U>) -> PerNs<U> {
-        PerNs { types: self.types.and_then(&f), values: self.values.and_then(&f) }
+    pub fn or(self, other: PerNs<T>) -> PerNs<T> {
+        PerNs {
+            types: self.types.or(other.types),
+            values: self.values.or(other.values),
+            macros: self.macros.or(other.macros),
+        }
     }
 
+    /// Map types and values. Leave macros unchanged.
     pub fn map<U>(self, f: impl Fn(T) -> U) -> PerNs<U> {
-        PerNs { types: self.types.map(&f), values: self.values.map(&f) }
+        PerNs { types: self.types.map(&f), values: self.values.map(&f), macros: self.macros }
     }
 }
diff --git a/crates/ra_hir/src/nameres/raw.rs b/crates/ra_hir/src/nameres/raw.rs
index c646d3d00..04b97cb90 100644
--- a/crates/ra_hir/src/nameres/raw.rs
+++ b/crates/ra_hir/src/nameres/raw.rs
@@ -76,8 +76,10 @@ impl RawItems {
             source_map: ImportSourceMap::default(),
         };
         if let Some(node) = db.parse_or_expand(file_id) {
-            if let Some(source_file) = ast::SourceFile::cast(node) {
+            if let Some(source_file) = ast::SourceFile::cast(node.clone()) {
                 collector.process_module(None, source_file);
+            } else if let Some(item_list) = ast::MacroItems::cast(node) {
+                collector.process_module(None, item_list);
             }
         }
         (Arc::new(collector.raw_items), Arc::new(collector.source_map))
diff --git a/crates/ra_hir/src/nameres/tests.rs b/crates/ra_hir/src/nameres/tests.rs
index 4ff897ca5..bc4b47b70 100644
--- a/crates/ra_hir/src/nameres/tests.rs
+++ b/crates/ra_hir/src/nameres/tests.rs
@@ -12,8 +12,7 @@ use test_utils::covers;
 
 use crate::{
     mock::{CrateGraphFixture, MockDatabase},
-    nameres::Resolution,
-    Crate, Either,
+    Crate,
 };
 
 use super::*;
@@ -37,35 +36,38 @@ fn render_crate_def_map(map: &CrateDefMap) -> String {
         *buf += path;
         *buf += "\n";
 
-        let items = map.modules[module].scope.items.iter().map(|(name, it)| (name, Either::A(it)));
-        let macros = map.modules[module].scope.macros.iter().map(|(name, m)| (name, Either::B(m)));
-        let mut entries = items.chain(macros).collect::<Vec<_>>();
-
+        let mut entries = map.modules[module]
+            .scope
+            .items
+            .iter()
+            .map(|(name, res)| (name, res.def))
+            .collect::<Vec<_>>();
         entries.sort_by_key(|(name, _)| *name);
+
         for (name, res) in entries {
-            match res {
-                Either::A(it) => {
-                    *buf += &format!("{}: {}\n", name, dump_resolution(it));
-                }
-                Either::B(_) => {
-                    *buf += &format!("{}: m\n", name);
-                }
+            *buf += &format!("{}:", name);
+
+            if res.types.is_some() {
+                *buf += " t";
+            }
+            if res.values.is_some() {
+                *buf += " v";
+            }
+            if res.macros.is_some() {
+                *buf += " m";
+            }
+            if res.is_none() {
+                *buf += " _";
             }
+
+            *buf += "\n";
         }
+
         for (name, child) in map.modules[module].children.iter() {
             let path = path.to_string() + &format!("::{}", name);
             go(buf, map, &path, *child);
         }
     }
-
-    fn dump_resolution(resolution: &Resolution) -> &'static str {
-        match (resolution.def.types.is_some(), resolution.def.values.is_some()) {
-            (true, true) => "t v",
-            (true, false) => "t",
-            (false, true) => "v",
-            (false, false) => "_",
-        }
-    }
 }
 
 fn def_map(fixtute: &str) -> String {
diff --git a/crates/ra_hir/src/nameres/tests/macros.rs b/crates/ra_hir/src/nameres/tests/macros.rs
index ebc4d6890..20ee63c67 100644
--- a/crates/ra_hir/src/nameres/tests/macros.rs
+++ b/crates/ra_hir/src/nameres/tests/macros.rs
@@ -21,7 +21,6 @@ fn macro_rules_are_globally_visible() {
    ⋮crate
    ⋮Foo: t v
    ⋮nested: t
-   ⋮structs: m
    ⋮
    ⋮crate::nested
    ⋮Bar: t v
@@ -47,7 +46,6 @@ fn macro_rules_can_define_modules() {
     );
     assert_snapshot!(map, @r###"
    ⋮crate
-   ⋮m: m
    ⋮n1: t
    ⋮
    ⋮crate::n1
@@ -133,7 +131,6 @@ fn unexpanded_macro_should_expand_by_fixedpoint_loop() {
    ⋮crate
    ⋮Foo: t v
    ⋮bar: m
-   ⋮baz: m
    ⋮foo: m
     "###);
 }
@@ -271,7 +268,6 @@ fn prelude_cycle() {
         ⋮prelude: t
         ⋮
         ⋮crate::prelude
-        ⋮declare_mod: m
     "###);
 }
 
@@ -345,7 +341,6 @@ fn plain_macros_are_legacy_textual_scoped() {
    ⋮Ok: t v
    ⋮OkAfter: t v
    ⋮OkShadowStop: t v
-   ⋮foo: m
    ⋮m1: t
    ⋮m2: t
    ⋮m3: t
@@ -354,28 +349,132 @@ fn plain_macros_are_legacy_textual_scoped() {
    ⋮ok_double_macro_use_shadow: v
    ⋮
    ⋮crate::m7
-   ⋮baz: m
    ⋮
    ⋮crate::m1
-   ⋮bar: m
    ⋮
    ⋮crate::m5
    ⋮m6: t
    ⋮
    ⋮crate::m5::m6
-   ⋮foo: m
    ⋮
    ⋮crate::m2
    ⋮
    ⋮crate::m3
    ⋮OkAfterInside: t v
    ⋮OkMacroUse: t v
-   ⋮foo: m
    ⋮m4: t
    ⋮ok_shadow: v
    ⋮
    ⋮crate::m3::m4
-   ⋮bar: m
    ⋮ok_shadow_deep: v
     "###);
 }
+
+#[test]
+fn type_value_macro_live_in_different_scopes() {
+    let map = def_map(
+        "
+        //- /main.rs
+        #[macro_export]
+        macro_rules! foo {
+            ($x:ident) => { type $x = (); }
+        }
+
+        foo!(foo);
+        use foo as bar;
+
+        use self::foo as baz;
+        fn baz() {}
+        ",
+    );
+    assert_snapshot!(map, @r###"
+        ⋮crate
+        ⋮bar: t m
+        ⋮baz: t v m
+        ⋮foo: t m
+    "###);
+}
+
+#[test]
+fn macro_use_can_be_aliased() {
+    let map = def_map_with_crate_graph(
+        "
+        //- /main.rs
+        #[macro_use]
+        extern crate foo;
+
+        foo!(Direct);
+        bar!(Alias);
+
+        //- /lib.rs
+        use crate::foo as bar;
+
+        mod m {
+            #[macro_export]
+            macro_rules! foo {
+                ($x:ident) => { struct $x; }
+            }
+        }
+        ",
+        crate_graph! {
+            "main": ("/main.rs", ["foo"]),
+            "foo": ("/lib.rs", []),
+        },
+    );
+    assert_snapshot!(map, @r###"
+        ⋮crate
+        ⋮Alias: t v
+        ⋮Direct: t v
+        ⋮foo: t
+    "###);
+}
+
+#[test]
+fn path_quantified_macros() {
+    let map = def_map(
+        "
+        //- /main.rs
+        macro_rules! foo {
+            ($x:ident) => { struct $x; }
+        }
+
+        crate::foo!(NotResolved);
+
+        crate::bar!(OkCrate);
+        bar!(OkPlain);
+        alias1!(NotHere);
+        m::alias1!(OkAliasPlain);
+        m::alias2!(OkAliasSuper);
+        m::alias3!(OkAliasCrate);
+        not_found!(NotFound);
+
+        mod m {
+            #[macro_export]
+            macro_rules! bar {
+                ($x:ident) => { struct $x; }
+            }
+
+            pub use bar as alias1;
+            pub use super::bar as alias2;
+            pub use crate::bar as alias3;
+            pub use self::bar as not_found;
+        }
+        ",
+    );
+    assert_snapshot!(map, @r###"
+        ⋮crate
+        ⋮OkAliasCrate: t v
+        ⋮OkAliasPlain: t v
+        ⋮OkAliasSuper: t v
+        ⋮OkCrate: t v
+        ⋮OkPlain: t v
+        ⋮bar: m
+        ⋮m: t
+        ⋮
+        ⋮crate::m
+        ⋮alias1: m
+        ⋮alias2: m
+        ⋮alias3: m
+        ⋮not_found: _
+    "###);
+}