From 4e25ae480753baca2664d32cea6591f6cd221a32 Mon Sep 17 00:00:00 2001
From: Ryan Levick <me@ryanlevick.com>
Date: Mon, 26 Apr 2021 12:14:10 +0200
Subject: [PATCH] Pass unstable options to error index rustdoc invocation

---
 src/bootstrap/test.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
index 117201ab3cd8..977d6ca8e8e5 100644
--- a/src/bootstrap/test.rs
+++ b/src/bootstrap/test.rs
@@ -1687,6 +1687,9 @@ fn markdown_test(builder: &Builder<'_>, compiler: Compiler, markdown: &Path) ->
     builder.info(&format!("doc tests for: {}", markdown.display()));
     let mut cmd = builder.rustdoc_cmd(compiler);
     builder.add_rust_test_threads(&mut cmd);
+    // allow for unstable options such as new editions
+    cmd.arg("-Z");
+    cmd.arg("unstable-options");
     cmd.arg("--test");
     cmd.arg(markdown);
     cmd.env("RUSTC_BOOTSTRAP", "1");