From d5a0874bea51344d028a0481c408dca793e20924 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Fri, 29 Sep 2023 06:30:28 +0200
Subject: [PATCH] fix: symbols of named dimensionless units with the ratio = 1
 were not printed

---
 src/core/include/mp-units/unit.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/include/mp-units/unit.h b/src/core/include/mp-units/unit.h
index a15b0f7c..c4343c45 100644
--- a/src/core/include/mp-units/unit.h
+++ b/src/core/include/mp-units/unit.h
@@ -695,7 +695,7 @@ constexpr Out print_separator(Out out, unit_symbol_formatting fmt)
 template<Unit U>
 [[nodiscard]] consteval bool has_unit_symbol(U)
 {
-  return !std::derived_from<U, derived_unit<>>;
+  return requires { U::symbol; } || !std::derived_from<U, derived_unit<>>;
 }
 
 template<typename CharT, std::output_iterator<CharT> Out, Unit U>