From 5643c32f7f2c886015df459f26b4d72adaee1207 Mon Sep 17 00:00:00 2001
From: Hernan Grecco <hgrecco@gmail.com>
Date: Mon, 1 May 2023 19:59:19 -0300
Subject: [PATCH] Fix 3.9 support. TypeAlias is supported in 3.10+

---
 pint/util.py | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/pint/util.py b/pint/util.py
index 149945bcf..d75d1b5f4 100644
--- a/pint/util.py
+++ b/pint/util.py
@@ -24,7 +24,6 @@
 from typing import (
     TYPE_CHECKING,
     ClassVar,
-    TypeAlias,
     Callable,
     TypeVar,
     Any,
@@ -48,8 +47,12 @@
 
 T = TypeVar("T")
 TH = TypeVar("TH", bound=Hashable)
-ItMatrix: TypeAlias = Iterable[Iterable[PintScalar]]
-Matrix: TypeAlias = list[list[PintScalar]]
+
+# TODO: Change when Python 3.10 becomes minimal version.
+# ItMatrix: TypeAlias = Iterable[Iterable[PintScalar]]
+# Matrix: TypeAlias = list[list[PintScalar]]
+ItMatrix = Iterable[Iterable[PintScalar]]
+Matrix = list[list[PintScalar]]
 
 
 def _noop(x: T) -> T: