Make missing box opt.
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@ -14,10 +14,7 @@
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(define-unsafe-syntax-class unbox)
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(define-unsafe-syntax-class set-box!)
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(define-syntax-class box-op
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#:attributes (unsafe)
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(pattern :unbox^)
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(pattern :set-box!^))
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(define-merged-syntax-class box-op (unbox^ set-box!^))
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(define-syntax-class box-opt-expr
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#:commit
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