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theory ExPS6
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imports "Parser"
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begin
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(* example 6 from Peter Sewell's bestiary *)
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atom_decl name
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ML {* val _ = recursive := false *}
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nominal_datatype exp6 =
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EVar name
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| EPair exp6 exp6
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| ELetRec x::name p::pat6 e1::exp6 e2::exp6 bind x in e1, bind x in e2, bind "bp6 p" in e1
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and pat6 =
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PVar' name
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| PUnit'
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| PPair' pat6 pat6
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binder
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bp6 :: "pat6 \<Rightarrow> atom set"
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where
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"bp6 (PVar' x) = {atom x}"
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| "bp6 (PUnit') = {}"
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| "bp6 (PPair' p1 p2) = bp6 p1 \<union> bp6 p2"
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thm exp6_pat6.fv
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thm exp6_pat6.eq_iff
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thm exp6_pat6.bn
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thm exp6_pat6.perm
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thm exp6_pat6.induct
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thm exp6_pat6.distinct
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end
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