Print to stderr when a graphviz file can't be written

`warn` prints nothing by default
2020-10-05 10:12:48 -07:00 · 2020-10-05 10:12:48 -07:00 · 3b87398738
commit 3b87398738
parent 29e5e6e766
1 changed files with 1 additions and 1 deletions
--- a/compiler/rustc_mir/src/dataflow/framework/engine.rs
+++ b/compiler/rustc_mir/src/dataflow/framework/engine.rs
@ -248,7 +248,7 @@ where

        let res = write_graphviz_results(tcx, &body, &results, pass_name);
        if let Err(e) = res {
-            warn!("Failed to write graphviz dataflow results: {}", e);
+            error!("Failed to write graphviz dataflow results: {}", e);
        }

        results