From 570744638ab4b08286562c0f4d45a7928ed008b0 Mon Sep 17 00:00:00 2001
From: Pierre Courtieu
Date: Fri, 22 Jan 2021 14:45:08 +0100
Subject: Fix #13739 - disable some warnings when calling Function.

Also added a generic way of temporarily disabling a warning.
Also added try_finalize un lib/utils.ml.
---
 test-suite/output/Function.out |  0
 test-suite/output/Function.v   | 31 +++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 test-suite/output/Function.out
 create mode 100644 test-suite/output/Function.v

(limited to 'test-suite')

diff --git a/test-suite/output/Function.out b/test-suite/output/Function.out
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/test-suite/output/Function.v b/test-suite/output/Function.v
new file mode 100644
index 0000000000..b3e2a93895
--- /dev/null
+++ b/test-suite/output/Function.v
@@ -0,0 +1,31 @@
+Require Import FunInd List.
+
+(* Explanations: This kind of pattern matching displays a legitimate
+   unused variable warning in v8.13.
+
+Fixpoint f (l:list nat) : nat :=
+  match l with
+  | nil => O
+  | S n :: nil  => 1
+  | x :: l'  => f l'
+  end.
+*)
+
+(* In v8.13 the same code with "Function" generates a lot more
+   warnings about variables created automatically by Function. These
+   are not legitimate. PR #13776 (post v8.13) removes all warnings
+   about pattern matching variables (and non truly recursive fixpoint)
+   for "Function". So this should not generate any warning. Note that
+   this PR removes also the legitimate warnings. It would be better if
+   this test generate the same warning as the Fixpoint above. This
+   test would then need to be updated. *)
+
+(* Ensuring the warning is a warning. *)
+Set Warnings "matching-variable".
+(* But no warning generated here. *)
+Function f (l:list nat) : nat :=
+  match l with
+  | nil => O
+  | S n :: nil  => 1
+  | n :: l'  => f l'
+  end.
-- 
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