Include argument names when reporting range errors

Closes #771

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.22.9
+
+* Include argument names when reporting range errors.
+
 ## 1.22.8
 
 ### JavaScript API

lib/src/value/number.dart

@@ -209,7 +209,8 @@ class SassNumber extends Value implements ext.SassNumber {
     var result = fuzzyCheckRange(value, min, max);
     if (result != null) return result;
     throw _exception(
-        "Expected $this to be within $min$unitString and $max$unitString.");
+        "Expected $this to be within $min$unitString and $max$unitString.",
+        name);
   }
 
   bool hasUnit(String unit) =>

pubspec.yaml

@@ -1,5 +1,5 @@
 name: sass
-version: 1.22.8
+version: 1.22.9-dev
 description: A Sass implementation in Dart.
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/sass/dart-sass