From a9be64012490417d1c341f830e8268137b3d03c4 Mon Sep 17 00:00:00 2001
From: Connor Skees <connor1skees@gmail.com>
Date: Sat, 15 Aug 2020 21:33:44 -0400
Subject: [PATCH] arguments do not affect variables in outer scopes

---
 src/parse/args.rs |  2 +-
 tests/args.rs     | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/parse/args.rs b/src/parse/args.rs
index f484bc3..561c98b 100644
--- a/src/parse/args.rs
+++ b/src/parse/args.rs
@@ -390,7 +390,7 @@ impl<'a> Parser<'a> {
                 },
             }?
             .node;
-            self.scopes.insert_var(arg.name, val.clone());
+            self.scopes.insert_var_last(arg.name, val.clone());
             scope.insert_var(arg.name, val);
         }
         self.scopes.exit_scope();
diff --git a/tests/args.rs b/tests/args.rs
index 8cb7e81..f39457f 100644
--- a/tests/args.rs
+++ b/tests/args.rs
@@ -196,3 +196,20 @@ test!(
     }"#,
     "a {\n  color: 'Roboto, \"Helvetica Neue\", sans-serif';\n}\n"
 );
+test!(
+    args_do_not_affect_existing_outer_variables,
+    "@mixin mixin2($a) {
+        color: $a;
+    }
+
+    @mixin mixin1($a) {
+        color: $a;
+        @include mixin2(bar);
+        color: $a;
+    }
+
+    a {
+        @include mixin1(foo);
+    }",
+    "a {\n  color: foo;\n  color: bar;\n  color: foo;\n}\n"
+);