1 files changed, 5 insertions, 0 deletions
diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
index ac833a55d4c..afa72b5d58c 100644
--- a/src/bootstrap/test.rs
+++ b/src/bootstrap/test.rs
@@ -1754,6 +1754,11 @@ impl Step for Crate {
             cargo.arg("--quiet");
         }
 
+        if builder.config.cmd.bless() {
+            // Bless `expect!` tests.
+            cargo.env("UPDATE_EXPECT", "1");
+        }
+
         if target.contains("emscripten") {
             cargo.env(
                 format!("CARGO_TARGET_{}_RUNNER", envify(&target.triple)),