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(* A more advanced example of how to explore the structure of terms of
type constr is given in the coq-dpdgraph plugin. *)
let simple_body_access gref =
match gref with
| Globnames.VarRef _ ->
failwith "variables are not covered in this example"
| Globnames.IndRef _ ->
failwith "inductive types are not covered in this example"
| Globnames.ConstructRef _ ->
failwith "constructors are not covered in this example"
| Globnames.ConstRef cst ->
let cb = Environ.lookup_constant cst (Global.env()) in
match Global.body_of_constant_body Library.indirect_accessor cb with
| Some(e, _) -> EConstr.of_constr e
| None -> failwith "This term has no value"
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