3 files changed, 47 insertions, 0 deletions

diff --git a/crates/ra_syntax/src/ast.rs b/crates/ra_syntax/src/ast.rs
index e968c9728..3aaa5edda 100644
--- a/crates/ra_syntax/src/ast.rs
+++ b/crates/ra_syntax/src/ast.rs
@@ -115,6 +115,7 @@ pub trait DocCommentsOwner<'a>: AstNode<'a> {
     /// That is, strips leading `///` and joins lines
     fn doc_comment_text(self) -> RustString {
         self.doc_comments()
+            .filter(|comment| comment.is_doc_comment())
             .map(|comment| {
                 let prefix = comment.prefix();
                 let trimmed = comment
@@ -206,6 +207,10 @@ impl<'a> Comment<'a> {
         }
     }
 
+    pub fn is_doc_comment(&self) -> bool {
+        self.flavor().is_doc_comment()
+    }
+
     pub fn prefix(&self) -> &'static str {
         self.flavor().prefix()
     }
@@ -237,6 +242,13 @@ impl CommentFlavor {
             Multiline => "/*",
         }
     }
+
+    pub fn is_doc_comment(&self) -> bool {
+        match self {
+            CommentFlavor::Doc | CommentFlavor::ModuleDoc => true,
+            _ => false,
+        }
+    }
 }
 
 impl<'a> Whitespace<'a> {
@@ -469,3 +481,16 @@ impl<'a> PrefixExpr<'a> {
         }
     }
 }
+
+#[test]
+fn test_doc_comment_of_items() {
+    let file = SourceFileNode::parse(
+        r#"
+        //! doc
+        // non-doc
+        mod foo {}
+        "#,
+    );
+    let module = file.syntax().descendants().find_map(Module::cast).unwrap();
+    assert_eq!("doc", module.doc_comment_text());
+}
diff --git a/crates/ra_syntax/tests/data/parser/ok/0037_mod.rs b/crates/ra_syntax/tests/data/parser/ok/0037_mod.rs
new file mode 100644
index 000000000..7e5a1b835
--- /dev/null
+++ b/crates/ra_syntax/tests/data/parser/ok/0037_mod.rs
@@ -0,0 +1,5 @@
+// https://github.com/rust-analyzer/rust-analyzer/issues/357
+
+//! docs
+// non-docs
+mod foo {}
\ No newline at end of file
diff --git a/crates/ra_syntax/tests/data/parser/ok/0037_mod.txt b/crates/ra_syntax/tests/data/parser/ok/0037_mod.txt
new file mode 100644
index 000000000..e11c4a06d
--- /dev/null
+++ b/crates/ra_syntax/tests/data/parser/ok/0037_mod.txt
@@ -0,0 +1,17 @@
+SOURCE_FILE@[0; 93)
+  COMMENT@[0; 60)
+  WHITESPACE@[60; 62)
+  MODULE@[62; 93)
+    COMMENT@[62; 70)
+    WHITESPACE@[70; 71)
+    COMMENT@[71; 82)
+    WHITESPACE@[82; 83)
+    MOD_KW@[83; 86)
+    WHITESPACE@[86; 87)
+    NAME@[87; 90)
+      IDENT@[87; 90) "foo"
+    WHITESPACE@[90; 91)
+    ITEM_LIST@[91; 93)
+      L_CURLY@[91; 92)
+      R_CURLY@[92; 93)
+