From 6f62fae92679fdcaad5909b15513df1a963b29ac Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Mon, 12 Dec 2016 09:03:35 -0800
Subject: [PATCH] rustbuild: Enable unstable features in rustdoc

This ensures that stable releases produced by rustbuild will succeed in testing
as some of the rustdoc tests use unstable features.
---
 src/bootstrap/check.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/bootstrap/check.rs b/src/bootstrap/check.rs
index e0798860275..712c4c52baa 100644
--- a/src/bootstrap/check.rs
+++ b/src/bootstrap/check.rs
@@ -299,6 +299,7 @@ fn markdown_test(build: &Build, compiler: &Compiler, markdown: &Path) {
     build.add_rust_test_threads(&mut cmd);
     cmd.arg("--test");
     cmd.arg(markdown);
+    cmd.env("RUSTC_BOOTSTRAP", "1");
 
     let mut test_args = build.flags.cmd.test_args().join(" ");
     if build.config.quiet_tests {