From b93e3c6f2160b00acf606ae8130708b1bb1dd4a6 Mon Sep 17 00:00:00 2001
From: ConnorSkees <39542938+ConnorSkees@users.noreply.github.com>
Date: Thu, 2 Apr 2020 00:28:03 -0400
Subject: [PATCH] handle while with empty condition

---
 src/atrule/mod.rs | 5 +++++
 tests/while.rs    | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/src/atrule/mod.rs b/src/atrule/mod.rs
index f054e71..b40ef56 100644
--- a/src/atrule/mod.rs
+++ b/src/atrule/mod.rs
@@ -317,6 +317,11 @@ impl AtRule {
                 let mut stmts = Vec::new();
                 devour_whitespace(toks);
                 let cond = read_until_open_curly_brace(toks);
+
+                if cond.is_empty() {
+                    return Err("Expected expression.".into());
+                }
+
                 toks.next();
                 let scope = &mut scope.clone();
                 let body = read_until_closing_curly_brace(toks);
diff --git a/tests/while.rs b/tests/while.rs
index 8b4314b..f66e08e 100644
--- a/tests/while.rs
+++ b/tests/while.rs
@@ -23,3 +23,7 @@ test!(
     "@while false {\na {\n    color: $b;\n  }\n  $b: $b + 1;\n}",
     ""
 );
+error!(
+    while_empty_condition,
+    "@while {}", "Error: Expected expression."
+);