Merge branch 'v8.5' into trunk

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diff --git a/plugins/extraction/ExtrHaskellNatInteger.v b/plugins/extraction/ExtrHaskellNatInteger.v
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+(** Extraction of [nat] into Haskell's [Integer] *)
+
+Require Import Arith.
+Require Import ExtrHaskellNatNum.
+
+(**
+ * Disclaimer: trying to obtain efficient certified programs
+ * by extracting [nat] into [Integer] isn't necessarily a good idea.
+ * See comments in [ExtrOcamlNatInt.v].
+*)
+
+Extract Inductive nat => "Prelude.Integer" [ "0" "Prelude.succ" ]
+  "(\fO fS n -> if n Prelude.== 0 then fO () else fS (n Prelude.- 1))".