From 6ea822df54750c03805b50e2f62ec129a7f30a09 Mon Sep 17 00:00:00 2001
From: Taylor Cramer <cramertaylorj@gmail.com>
Date: Thu, 21 Nov 2024 10:58:56 -0800
Subject: [PATCH] Add instructions to test error code docs (#2145)

---
 src/diagnostics/error-codes.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/diagnostics/error-codes.md b/src/diagnostics/error-codes.md
index fc2fe190..1b6b87e4 100644
--- a/src/diagnostics/error-codes.md
+++ b/src/diagnostics/error-codes.md
@@ -93,3 +93,12 @@ struct_span_code_err!(...)
 For an example of a PR adding an error code, see [#76143].
 
 [#76143]: https://github.com/rust-lang/rust/pull/76143
+
+## Running error code doctests
+
+To test the examples added in `rustc_error_codes/src/error_codes`, run the
+error index generator using:
+
+```
+./x test ./src/tools/error_index_generator
+```