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-rw-r--r--src/bootstrap/bootstrap.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 28f5192f2cd..a94792a2f9f 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -815,6 +815,7 @@ def bootstrap(help_triggered):
     env["BOOTSTRAP_PARENT_ID"] = str(os.getpid())
     env["BOOTSTRAP_PYTHON"] = sys.executable
     env["BUILD_DIR"] = build.build_dir
+    env["RUSTC_BOOTSTRAP"] = '1'
     run(args, env=env, verbose=build.verbose)