Fix panic when extracting struct

crates/assists/src/assist_context.rs

@@ -277,10 +277,11 @@ impl AssistBuilder {
         algo::diff(old.syntax(), new.syntax()).into_text_edit(&mut self.edit)
     }
     pub(crate) fn rewrite(&mut self, rewriter: SyntaxRewriter) {
-        let node = rewriter.rewrite_root().unwrap();
+        if let Some(node) = rewriter.rewrite_root() {
             let new = rewriter.rewrite(&node);
             algo::diff(&node, &new).into_text_edit(&mut self.edit);
         }
+    }
 
     fn finish(mut self) -> SourceChange {
         self.commit();

crates/assists/src/handlers/extract_struct_from_enum_variant.rs

@@ -378,6 +378,36 @@ use crate::E;
 fn f() {
     let e = E::V(V(9, 2));
 }
+"#,
+        )
+    }
+
+    #[test]
+    fn test_several_files_record() {
+        // FIXME: this should fix the usage as well!
+        check_assist(
+            extract_struct_from_enum_variant,
+            r#"
+//- /main.rs
+enum E {
+    <|>V { i: i32, j: i32 }
+}
+mod foo;
+
+//- /foo.rs
+use crate::E;
+fn f() {
+    let e = E::V { i: 9, j: 2 };
+}
+"#,
+            r#"
+struct V{ pub i: i32, pub j: i32 }
+
+enum E {
+    V(V)
+}
+mod foo;
+
 "#,
         )
     }