From 0f6f73ecf3c2ebfe5b218edc0765886ccdca6f7f Mon Sep 17 00:00:00 2001
From: Alex Waygood <Alex.Waygood@Gmail.com>
Date: Fri, 5 Jul 2024 12:53:30 +0100
Subject: [PATCH] [red-knot] Require that `FileSystem` objects implement
 `Debug` (#12204)

---
 crates/ruff_db/src/file_system.rs    | 2 +-
 crates/ruff_db/src/file_system/os.rs | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/crates/ruff_db/src/file_system.rs b/crates/ruff_db/src/file_system.rs
index 740bbec560696..1e6e90059219b 100644
--- a/crates/ruff_db/src/file_system.rs
+++ b/crates/ruff_db/src/file_system.rs
@@ -21,7 +21,7 @@ pub type Result<T> = std::io::Result<T>;
 /// * Accessing unsaved or even untitled files in the LSP use case
 /// * Testing with an in-memory file system
 /// * Running Ruff in a WASM environment without needing to stub out the full `std::fs` API.
-pub trait FileSystem {
+pub trait FileSystem: std::fmt::Debug {
     /// Reads the metadata of the file or directory at `path`.
     fn metadata(&self, path: &FileSystemPath) -> Result<Metadata>;
 
diff --git a/crates/ruff_db/src/file_system/os.rs b/crates/ruff_db/src/file_system/os.rs
index 057334c5b7f9a..d3f5faf40e9ac 100644
--- a/crates/ruff_db/src/file_system/os.rs
+++ b/crates/ruff_db/src/file_system/os.rs
@@ -2,7 +2,7 @@ use filetime::FileTime;
 
 use crate::file_system::{FileSystem, FileSystemPath, FileType, Metadata, Result};
 
-#[derive(Default)]
+#[derive(Default, Debug)]
 pub struct OsFileSystem;
 
 impl OsFileSystem {