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% test15.4.ott is_v test
% mtutual recursion between a single upper/lower type pair, with dot forms
indexvar index , n ::= {{ isa nat }} {{ coq nat }} {{ coq-equality }}
{{ hol num }} {{ ocaml int }}
metavar x ::= {{ isa nat }} {{ coq nat }} {{ coq-equality }} {{ hol string }} {{ ocaml int }}
grammar
a {{ isa pluto}} :: 'a_' ::=
| x :: :: Ax (+ b = x +)
| A a :: :: a (+ b = b(a) +)
| C a1 .. an :: :: C (+ b = b(a1..an) +)
| CC a1 .. an :: :: CC (+ b = b(a1..an) +)
av :: 'av_' ::=
| A a :: :: a
| C av1 .. avn :: :: C
| CC av1 .. avn :: :: CC
subrules
av <:: a
freevars
a x :: ftv
substitutions
single a x :: subst
multiple a x :: msubst
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