From 9193769161e1f06b371eed99dfe9e90fec9a14a6 Mon Sep 17 00:00:00 2001
From: Emilio Jesus Gallego Arias
Date: Wed, 5 Feb 2020 17:46:07 +0100
Subject: [build] Consolidate stdlib's .v files under a single directory.

Currently, `.v` under the `Coq.` prefix are found in both `theories`
and `plugins`. Usually these two directories are merged by special
loadpath code that allows double-binding of the prefix.

This adds some complexity to the build and loadpath system; and in
particular, it prevents from handling the `Coq.*` prefix in the
simple, `-R theories Coq` standard way.

We thus move all `.v` files to theories, leaving `plugins` as an
OCaml-only directory, and modify accordingly the loadpath / build
infrastructure.

Note that in general `plugins/foo/Foo.v` was not self-contained, in
the sense that it depended on files in `theories` and files in
`theories` depended on it; moreover, Coq saw all these files as
belonging to the same namespace so it didn't really care where they
lived.

This could also imply a performance gain as we now effectively
traverse less directories when locating a library.

See also discussion in #10003
---
 theories/extraction/ExtrHaskellNatInt.v | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 theories/extraction/ExtrHaskellNatInt.v

(limited to 'theories/extraction/ExtrHaskellNatInt.v')

diff --git a/theories/extraction/ExtrHaskellNatInt.v b/theories/extraction/ExtrHaskellNatInt.v
new file mode 100644
index 0000000000..267322d9ed
--- /dev/null
+++ b/theories/extraction/ExtrHaskellNatInt.v
@@ -0,0 +1,15 @@
+(** Extraction of [nat] into Haskell's [Int] *)
+
+Require Coq.extraction.Extraction.
+
+Require Import Arith.
+Require Import ExtrHaskellNatNum.
+
+(**
+ * Disclaimer: trying to obtain efficient certified programs
+ * by extracting [nat] into [Int] is definitively *not* a good idea.
+ * See comments in [ExtrOcamlNatInt.v].
+ *)
+
+Extract Inductive nat => "Prelude.Int" [ "0" "Prelude.succ" ]
+  "(\fO fS n -> if n Prelude.== 0 then fO () else fS (n Prelude.- 1))".
-- 
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