From 5eb53b5bc8d765ed75e965f43f1084e18efc8790 Mon Sep 17 00:00:00 2001
From: Hugo Herbelin
Date: Sun, 27 Apr 2014 15:09:04 +0200
Subject: Adding a field ci_cstr_nargs to case_info and mind_consnrealargs to
 one_inductive_body so that when eta-expanding at "match" printing time we
 know if a let is part of the expected signature or part of the body.

This is an easy fix for bugs like #3293. Another fix could be to
enforce, as an invariant, or better syntactically, that
"match"/"Case"'s have the body of their branches expanded.
---
 kernel/inductive.ml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'kernel/inductive.ml')

diff --git a/kernel/inductive.ml b/kernel/inductive.ml
index c0857566df..2b2caaf3bf 100644
--- a/kernel/inductive.ml
+++ b/kernel/inductive.ml
@@ -370,7 +370,8 @@ let check_case_info env indsp ci =
   if
     not (eq_ind indsp ci.ci_ind) ||
     not (Int.equal mib.mind_nparams ci.ci_npar) ||
-    not (Array.equal Int.equal mip.mind_consnrealdecls ci.ci_cstr_ndecls)
+    not (Array.equal Int.equal mip.mind_consnrealdecls ci.ci_cstr_ndecls) ||
+    not (Array.equal Int.equal mip.mind_consnrealargs ci.ci_cstr_nargs)
   then raise (TypeError(env,WrongCaseInfo(indsp,ci)))
 
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