From 6c7473d0248602060d764cd355363ac6b69b8ae3 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Wed, 8 Aug 2018 21:42:26 -0700
Subject: [PATCH] Deny future duplication of rustc-ap-syntax

Enable the tidy check to forbid this!

Closes #53006
---
 src/tools/tidy/src/deps.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index 42f4e46085ebe..d63f479f29d94 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -353,7 +353,7 @@ fn check_crate_duplicate(resolve: &Resolve, bad: &mut bool) {
         // versions of them accidentally sneak into our dependency graph to
         // ensure we keep our CI times under control
         // "cargo", // FIXME(#53005)
-        // "rustc-ap-syntax", // FIXME(#53006)
+        "rustc-ap-syntax",
     ];
     let mut name_to_id = HashMap::new();
     for node in resolve.nodes.iter() {