1 files changed, 15 insertions, 0 deletions
diff --git a/src/tools/rustfmt/tests/source/markdown-comment.rs b/src/tools/rustfmt/tests/source/markdown-comment.rs
new file mode 100644
index 00000000000..1ec26562fe2
--- /dev/null
+++ b/src/tools/rustfmt/tests/source/markdown-comment.rs
@@ -0,0 +1,15 @@
+// Preserve two trailing whitespaces in doc comment,
+// but trim any whitespaces in normal comment.
+
+//! hello world  
+//! hello world 
+
+/// hello world    
+/// hello world 
+/// hello world  
+fn foo() {
+    // hello world  
+    // hello world 
+    let x = 3;
+    println!("x = {}", x);
+}