From fb88a441c973f74e61a06271891a3f1752d2d6c9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johel=20Ernesto=20Guerrero=20Pe=C3=B1a?=
 <johelegp@gmail.com>
Date: Sun, 31 May 2020 14:48:45 -0400
Subject: [PATCH] fix(gcc9): wrong use of Concepts TS terse syntax

---
 src/include/units/quantity_point.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/include/units/quantity_point.h b/src/include/units/quantity_point.h
index 51b869d7..b19c2240 100644
--- a/src/include/units/quantity_point.h
+++ b/src/include/units/quantity_point.h
@@ -220,7 +220,8 @@ quantity_point(quantity<D, U, Rep>) -> quantity_point<D, U, Rep>;
   return quantity_point(lhs.relative() - rhs);
 }
 
-[[nodiscard]] constexpr Quantity AUTO operator-(const QuantityPoint AUTO& lhs, const QuantityPoint AUTO& rhs)
+template<QuantityPoint QP1, QuantityPoint QP2>
+[[nodiscard]] constexpr Quantity AUTO operator-(const QP1& lhs, const QP2& rhs)
   requires requires { lhs.relative() - rhs.relative(); }
 {
   return lhs.relative() - rhs.relative();