From 316ffba3c859c15ca2d0ecdefb16fad3565a46bc Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Thu, 9 Nov 2023 09:30:22 +1100
Subject: [PATCH] Update instructions in a comment.

And avoid duplication.
---
 compiler/rustc_macros/src/symbols.rs | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/compiler/rustc_macros/src/symbols.rs b/compiler/rustc_macros/src/symbols.rs
index 4129712a6b2..3de4a904e5f 100644
--- a/compiler/rustc_macros/src/symbols.rs
+++ b/compiler/rustc_macros/src/symbols.rs
@@ -19,7 +19,9 @@
 //! ```bash
 //! cargo install cargo-expand          # this is necessary only once
 //! cd compiler/rustc_span
-//! cargo expand > /tmp/rustc_span.rs   # it's a big file
+//! # The specific version number in CFG_RELEASE doesn't matter.
+//! # The output is large.
+//! CFG_RELEASE="0.0.0" cargo +nightly expand > /tmp/rustc_span.rs
 //! ```
 
 use proc_macro2::{Span, TokenStream};
@@ -318,13 +320,4 @@ fn symbols_with_errors(input: TokenStream) -> (TokenStream, Vec<syn::Error>) {
     };
 
     (output, errors.list)
-
-    // To see the generated code, use the "cargo expand" command.
-    // Do this once to install:
-    //      cargo install cargo-expand
-    //
-    // Then, cd to rustc_span and run:
-    //      cargo expand > /tmp/rustc_span_expanded.rs
-    //
-    // and read that file.
 }