From 4e18be02a03ab478125aa6f08b30e738c3568572 Mon Sep 17 00:00:00 2001
From: Hugo Herbelin <Hugo.Herbelin@inria.fr>
Date: Fri, 23 Feb 2018 14:12:12 +0100
Subject: Fixes #6821 (bug in protecting notation printing from infinite
 eta-expansion).

More precisely when matching

   "f t" with "(fun ?x => .. ((fun ?x' => ?y) ?z') ..) ?z"

do not allow expansion of f since otherwise, we recursively have to
match "f t" with the same pattern.
---
 test-suite/output/bug6821.out | 2 ++
 test-suite/output/bug6821.v   | 8 ++++++++
 2 files changed, 10 insertions(+)
 create mode 100644 test-suite/output/bug6821.out
 create mode 100644 test-suite/output/bug6821.v

(limited to 'test-suite/output')

diff --git a/test-suite/output/bug6821.out b/test-suite/output/bug6821.out
new file mode 100644
index 000000000..7b12b5320
--- /dev/null
+++ b/test-suite/output/bug6821.out
@@ -0,0 +1,2 @@
+forall f : nat -> Type, f x where x : nat := 1
+     : Type
diff --git a/test-suite/output/bug6821.v b/test-suite/output/bug6821.v
new file mode 100644
index 000000000..40627e331
--- /dev/null
+++ b/test-suite/output/bug6821.v
@@ -0,0 +1,8 @@
+(* Was failing at printing time with stack overflow due to an infinite
+   eta-expansion *)
+
+Notation "x 'where' y .. z := v " :=
+  ((fun y => .. ((fun z => x) v) ..) v)
+  (at level 11, v at next level, y binder, z binder).
+
+Check forall f, f x where x := 1.
-- 
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