1 files changed, 9 insertions, 1 deletions

diff --git a/crates/ra_hir/src/has_source.rs b/crates/ra_hir/src/has_source.rs
index 63b8fd369..76c32fc17 100644
--- a/crates/ra_hir/src/has_source.rs
+++ b/crates/ra_hir/src/has_source.rs
@@ -2,7 +2,7 @@
 
 use either::Either;
 use hir_def::{
-    nameres::ModuleSource,
+    nameres::{ModuleOrigin, ModuleSource},
     src::{HasChildSource, HasSource as _},
     Lookup, VariantId,
 };
@@ -29,6 +29,14 @@ impl Module {
         def_map[self.id.local_id].definition_source(db.upcast())
     }
 
+    pub fn is_mod_rs(self, db: &dyn HirDatabase) -> bool {
+        let def_map = db.crate_def_map(self.id.krate);
+        match def_map[self.id.local_id].origin {
+            ModuleOrigin::File { is_mod_rs, .. } => is_mod_rs,
+            _ => false,
+        }
+    }
+
     /// Returns a node which declares this module, either a `mod foo;` or a `mod foo {}`.
     /// `None` for the crate root.
     pub fn declaration_source(self, db: &dyn HirDatabase) -> Option<InFile<ast::Module>> {