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-rw-r--r--src/libgraphviz/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libgraphviz/lib.rs b/src/libgraphviz/lib.rs
index 38b45ec0fea..2e26cc1b266 100644
--- a/src/libgraphviz/lib.rs
+++ b/src/libgraphviz/lib.rs
@@ -280,6 +280,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/",
        test(attr(allow(unused_variables), deny(warnings))))]
+#![cfg_attr(not(stage0), deny(warnings))]
 
 #![feature(str_escape)]