From a330f9a8f93e42d31d5463e22ea78636f100b69c Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Fri, 8 May 2020 21:17:35 +0200
Subject: [PATCH] Constraints for prefixed_alias_unit added

---
 src/include/units/unit.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/include/units/unit.h b/src/include/units/unit.h
index 1ff6fe06..6bf3db22 100644
--- a/src/include/units/unit.h
+++ b/src/include/units/unit.h
@@ -179,7 +179,12 @@ struct alias_unit : U {
   using prefix_family = PT;
 };
 
+// TODO gcc bug: 95015
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95015
+// template<Unit U, Prefix P, AliasUnit AU>
+//   requires (!AliasUnit<U>) && std::same_as<typename P::prefix_family, typename AU::prefix_family>
 template<Unit U, Prefix P, Unit AU>
+  requires std::same_as<typename P::prefix_family, typename AU::prefix_family>
 struct prefixed_alias_unit : U {
   static constexpr bool is_named = true;
   static constexpr auto symbol = P::symbol + AU::symbol;