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-rw-r--r--compiler/rustc_codegen_llvm/src/abi.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_codegen_llvm/src/abi.rs b/compiler/rustc_codegen_llvm/src/abi.rs
index 46e8e2a71cb..869c8e981f9 100644
--- a/compiler/rustc_codegen_llvm/src/abi.rs
+++ b/compiler/rustc_codegen_llvm/src/abi.rs
@@ -62,7 +62,7 @@ fn should_use_mutable_noalias(cx: &CodegenCx<'_, '_>) -> bool {
     //
     // For now, do not enable mutable_noalias by default at all, while the
     // issue is being figured out.
-    cx.tcx.sess.opts.debugging_opts.mutable_noalias
+    cx.tcx.sess.opts.debugging_opts.mutable_noalias.unwrap_or(false)
 }
 
 impl ArgAttributesExt for ArgAttributes {