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-rw-r--r--kernel/cinstr.mli6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/cinstr.mli b/kernel/cinstr.mli
index 4a3c03d85..f42c46175 100644
--- a/kernel/cinstr.mli
+++ b/kernel/cinstr.mli
@@ -31,7 +31,7 @@ and lambda =
| Lprim of pconstant * int (* arity *) * instruction * lambda array
| Lcase of case_info * reloc_table * lambda * lambda * lam_branches
| Lfix of (int array * int) * fix_decl
- | Lcofix of int * fix_decl
+ | Lcofix of int * fix_decl (* must be in eta-expanded form *)
| Lmakeblock of int * lambda array
| Lval of structured_constant
| Lsort of Sorts.t
@@ -39,6 +39,10 @@ and lambda =
| Lproj of int * Constant.t * lambda
| Luint of uint
+(* Cofixpoints have to be in eta-expanded form for their call-by-need evaluation
+to be correct. Otherwise, memoization of previous evaluations will be applied
+again to extra arguments (see #7333). *)
+
and lam_branches =
{ constant_branches : lambda array;
nonconstant_branches : (Name.t array * lambda) array }