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-rw-r--r--src/libcore/core.rc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libcore/core.rc b/src/libcore/core.rc
index 48c61e82cb0..971f8b57170 100644
--- a/src/libcore/core.rc
+++ b/src/libcore/core.rc
@@ -31,6 +31,8 @@
 // Don't link to core. We are core.
 #[no_core];
 
+#[legacy_modes];
+
 #[warn(vecs_implicitly_copyable)];
 #[deny(non_camel_case_types)];