From 4f5d2ffac2c15d00207f7452e7eb356b01de7317 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Fri, 28 Aug 2020 16:53:49 +0200
Subject: fmt import

---
 docs/dev/style.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/docs/dev/style.md b/docs/dev/style.md
index bb99c4855..397e85b35 100644
--- a/docs/dev/style.md
+++ b/docs/dev/style.md
@@ -112,6 +112,22 @@ Avoid local `use MyEnum::*` imports.
 
 Prefer `use crate::foo::bar` to `use super::bar`.
 
+When implementing `Debug` or `Display`, import `std::fmt`:
+
+```rust
+// Good
+use std::fmt;
+
+impl fmt::Display for RenameError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { .. }
+}
+
+// Not as good
+impl std::fmt::Display for RenameError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { .. }
+}
+```
+
 # Order of Items
 
 Optimize for the reader who sees the file for the first time, and wants to get a general idea about what's going on.
-- 
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