Make language notations stable under simpl.
Before they were not, for example: Check ('10 + '10 )%L. (* prints ('10 + '10)%L *) Eval simpl in ('10 + '10 )%L. (* prints (Lit 10 + Lit 10)%L *) The notation added by this comment is ambigious, for example the notation '10 + '10 is used for both: BinOp PlusOp (Lit (LitNat 10)) (Lit (LitNat 10)) BinOp PlusOp (of_val (LitV (LitNat 10))) (of_val (LitV (LitNat 10))) But fortunatelly, these terms are convertible. Note that literals 'x are now parsed as values (as a LitV), but still pretty printed when they appear as expressions (as a Lit).
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