repro

Cargo.toml

@@ -5,7 +5,7 @@ exclude = ["crates/proc_macro_test/imp"]
 [profile.dev]
 # Disabling debug info speeds up builds a bunch,
 # and we don't rely on it for debugging that much.
-debug = 0
+debug = 2
 
 [profile.dev.package]
 # These speed up local tests.

crates/ide_assists/src/handlers/extract_function.rs

@@ -4394,6 +4394,33 @@ pub fn testfn(arg: &mut Foo) {
 fn $0fun_name(arg: &mut Foo) {
     arg.field = 8;
 }
+"#,
+        );
+    }
+
+    #[test]
+    fn extract_function_copies_comments() {
+        check_assist(
+            extract_function,
+            r#"
+fn func() {
+    let i = 0;
+    $0
+    // comment here!
+    let x = 0;
+    $0
+}
+"#,
+            r#"
+fn func() {
+    let i = 0;
+    fun_name();
+}
+
+fn $0fun_name() {
+    // comment here!
+    let x = 0;
+}
 "#,
         );
     }