From f9e1ff68468cb831e58b8ebaa898864071d729a6 Mon Sep 17 00:00:00 2001
From: bjorn3 <bjorn3@users.noreply.github.com>
Date: Wed, 8 Jun 2022 14:31:36 +0000
Subject: [PATCH] Add doc comment

---
 .../src/abis/abi_1_63/proc_macro/diagnostic.rs               | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/crates/proc-macro-srv/src/abis/abi_1_63/proc_macro/diagnostic.rs b/crates/proc-macro-srv/src/abis/abi_1_63/proc_macro/diagnostic.rs
index fed84f0026fe..3fade2dc4f9c 100644
--- a/crates/proc-macro-srv/src/abis/abi_1_63/proc_macro/diagnostic.rs
+++ b/crates/proc-macro-srv/src/abis/abi_1_63/proc_macro/diagnostic.rs
@@ -1,3 +1,8 @@
+//! lib-proc-macro diagnostic
+//!
+//! Copy from <https://github.com/rust-lang/rust/blob/e45d9973b2665897a768312e971b82cc62633103/src/libproc_macro/diagnostic.rs>
+//! augmented with removing unstable features
+
 use super::Span;
 
 /// An enum representing a diagnostic level.