From f0c2522967b080defb2c35bf2f2eb3da674c0e2d Mon Sep 17 00:00:00 2001
From: ConnorSkees <39542938+ConnorSkees@users.noreply.github.com>
Date: Fri, 20 Mar 2020 23:15:51 -0400
Subject: [PATCH] better error message when missing `to` or `through`

---
 src/atrule/mod.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/atrule/mod.rs b/src/atrule/mod.rs
index da5cf5b..37170cb 100644
--- a/src/atrule/mod.rs
+++ b/src/atrule/mod.rs
@@ -136,6 +136,9 @@ impl AtRule {
                             break;
                         }
                         TokenKind::Keyword(Keyword::To(..)) => break,
+                        TokenKind::Symbol(Symbol::OpenCurlyBrace) => {
+                            return Err("Expected \"to\" or \"through\".".into());
+                        }
                         _ => from_toks.push(tok),
                     }
                 }