From c45df2a4bd0232882112f3f21899ec629b6fc603 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Mon, 4 Nov 2024 18:02:09 +0100
Subject: [PATCH] fix: `convertible_kinds` implementation fixed

---
 src/core/include/mp-units/framework/quantity_spec.h | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/core/include/mp-units/framework/quantity_spec.h b/src/core/include/mp-units/framework/quantity_spec.h
index f086e703..fe5cc052 100644
--- a/src/core/include/mp-units/framework/quantity_spec.h
+++ b/src/core/include/mp-units/framework/quantity_spec.h
@@ -1350,13 +1350,11 @@ template<QuantitySpec From, QuantitySpec To>
   };
   if constexpr ((NamedQuantitySpec<decltype(From{})> && NamedQuantitySpec<decltype(To{})>) ||
                 get_complexity(From{}) == get_complexity(To{}))
-    return convertible_impl(from_kind, to_kind);
+    return exploded_kind_result(convertible_impl(from_kind, to_kind));
   else if constexpr (get_complexity(From{}) > get_complexity(To{}))
-    return exploded_kind_result(
-      convertible_impl(get_kind_tree_root(explode<get_complexity(To{})>(from_kind).quantity), to_kind));
+    return exploded_kind_result(convertible_impl(explode<get_complexity(To{})>(from_kind).quantity, to_kind));
   else
-    return exploded_kind_result(
-      convertible_impl(from_kind, get_kind_tree_root(explode<get_complexity(From{})>(to_kind).quantity)));
+    return exploded_kind_result(convertible_impl(from_kind, explode<get_complexity(From{})>(to_kind).quantity));
 }
 
 template<NamedQuantitySpec From, NamedQuantitySpec To>