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-rw-r--r--interp/notation_ops.ml2
-rw-r--r--test-suite/output/bug6821.out2
-rw-r--r--test-suite/output/bug6821.v8
3 files changed, 11 insertions, 1 deletions
diff --git a/interp/notation_ops.ml b/interp/notation_ops.ml
index c65f4785e..9bc41a996 100644
--- a/interp/notation_ops.ml
+++ b/interp/notation_ops.ml
@@ -1132,7 +1132,7 @@ let rec match_ inner u alp metas sigma a1 a2 =
else f1,l1, f2, l2 in
let may_use_eta = does_not_come_from_already_eta_expanded_var f1 in
List.fold_left2 (match_ may_use_eta u alp metas)
- (match_in u alp metas sigma f1 f2) l1 l2
+ (match_hd u alp metas sigma f1 f2) l1 l2
| GLambda (na1,bk1,t1,b1), NLambda (na2,t2,b2) ->
match_extended_binders false u alp metas na1 na2 bk1 t1 (match_in u alp metas sigma t1 t2) b1 b2
| GProd (na1,bk1,t1,b1), NProd (na2,t2,b2) ->
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.