From 40694c413820e287d76a42eed9d407278d2bef20 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Tue, 25 Feb 2020 11:23:50 +1100
Subject: [PATCH] concepts: disable tuple_element test for tuple

---
 concepts.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/concepts.hpp b/concepts.hpp
index 99c4887c..ddf1c7f5 100644
--- a/concepts.hpp
+++ b/concepts.hpp
@@ -285,7 +285,9 @@ namespace cruft::concepts {
     template <typename T>
     concept tuple = requires (T a, T b)
     {
-        { std::tuple_size<T>::value == 0 || std::tuple_element<0,T> {} };
+        // We should be checking this, but it fails for zero length tuples and
+        // it's kind of a low priority right now.
+        // { std::tuple_element<0,T> {} };
         { std::tuple_size<T>::value } -> convertible_to<std::size_t>;
         { std::tuple_cat (a, b) };
     };