From e70d47b3b5b9bb8bb680264cee6d88d9c74277bc Mon Sep 17 00:00:00 2001
From: Aaron Hill <aa1ronham@gmail.com>
Date: Mon, 15 Mar 2021 12:26:49 -0400
Subject: [PATCH] Mark `extern_mod_stmt_cnum` as `eval_always`

This query reads from global untracked state, so it always needs to be
evaluated.
---
 compiler/rustc_middle/src/query/mod.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/compiler/rustc_middle/src/query/mod.rs b/compiler/rustc_middle/src/query/mod.rs
index b03b26d64606c..c5697ff1ce1cb 100644
--- a/compiler/rustc_middle/src/query/mod.rs
+++ b/compiler/rustc_middle/src/query/mod.rs
@@ -1278,6 +1278,8 @@ rustc_queries! {
         desc { |tcx| "collecting child items of `{}`", tcx.def_path_str(def_id) }
     }
     query extern_mod_stmt_cnum(def_id: LocalDefId) -> Option<CrateNum> {
+        // This depends on untracked global state (`tcx.extern_crate_map`)
+        eval_always
         desc { |tcx| "computing crate imported by `{}`", tcx.def_path_str(def_id.to_def_id()) }
     }