Scheme expr_ind2 := Induction for Csyntax.expr Sort Prop
with exprlist_ind2 := Induction for Csyntax.exprlist Sort Prop.
Combined Scheme expr_exprlist_ind from expr_ind2, exprlist_ind2.

Lemma transl_expression_meets_spec:
forall r g s a g' I,
transl_expression r g = Res (s, a) g' I ->
tr_expression r s a.