From 5ed2d4233472a37b1754804257930d29b5cd7b4b Mon Sep 17 00:00:00 2001
From: Eduard-Mihai Burtescu <edy.burt@gmail.com>
Date: Fri, 20 Nov 2020 19:34:44 +0200
Subject: [PATCH] Direct RUSTC_LOG (tracing/log) output to stderr instead of
 stdout.

---
 compiler/rustc_driver/src/lib.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/rustc_driver/src/lib.rs b/compiler/rustc_driver/src/lib.rs
index c5447612555..e49e456792b 100644
--- a/compiler/rustc_driver/src/lib.rs
+++ b/compiler/rustc_driver/src/lib.rs
@@ -1286,6 +1286,7 @@ pub fn init_env_logger(env: &str) {
     }
     let filter = tracing_subscriber::EnvFilter::from_env(env);
     let layer = tracing_tree::HierarchicalLayer::default()
+        .with_writer(io::stderr)
         .with_indent_lines(true)
         .with_ansi(true)
         .with_targets(true)