handle no value after /

src/value/parse.rs

@@ -599,6 +599,9 @@ impl Value {
             }
             '/' => {
                 toks.next();
+                if toks.peek().is_none() {
+                    return Err("Expected expression.".into());
+                }
                 if '*' == toks.peek().unwrap().kind {
                     toks.next();
                     eat_comment(toks, &Scope::new(), &Selector::new())?;

tests/error.rs

@@ -53,3 +53,7 @@ error!(
     "a{l {color: foo;}}", "Error: expected selector."
 );
 error!(backtick_in_selector, "a`{}", "Error: expected selector.");
+error!(
+    no_value_after_forward_slash,
+    "a {color: 303/;}", "Error: Expected expression."
+);