From 55bcd1d1ddbb141751480693663845eecb202f85 Mon Sep 17 00:00:00 2001
From: Connor Skees <connor1skees@gmail.com>
Date: Tue, 4 Aug 2020 01:35:49 -0400
Subject: [PATCH] resolve panic from malformed filter argument

---
 src/parse/args.rs | 4 +++-
 tests/args.rs     | 4 ++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/parse/args.rs b/src/parse/args.rs
index 8de7c39..d8875d2 100644
--- a/src/parse/args.rs
+++ b/src/parse/args.rs
@@ -341,7 +341,9 @@ impl<'a> Parser<'a> {
                                 return Err(("expected \")\".", pos).into());
                             }
                         }
-                        Some(..) => unreachable!(),
+                        Some(Token { pos, .. }) => {
+                            return Err(("expected \")\".", *pos).into());
+                        }
                         None => return Err(("expected \")\".", span).into()),
                     }
                 }
diff --git a/tests/args.rs b/tests/args.rs
index e06da77..adde390 100644
--- a/tests/args.rs
+++ b/tests/args.rs
@@ -172,6 +172,10 @@ error!(
     unclosed_paren_in_nested_args,
     "a { color: a(b(red); }", "Error: expected \")\"."
 );
+error!(
+    filter_rhs_missing_closing_paren,
+    "a { color: lighten(red=(green); }", "Error: expected \")\"."
+);
 test!(
     space_after_loud_comment,
     "@mixin foo($x) {