fix panic when missing colon in style

src/lib.rs

@@ -190,21 +190,20 @@ pub(crate) fn eat_expr<I: Iterator<Item = Token>>(
         span = span.merge(tok.pos());
         match tok.kind {
             ':' => {
-                let tok = toks.next();
+                let tok = toks.next().unwrap();
+                values.push(tok);
                 if devour_whitespace(toks) {
                     let prop = Style::parse_property(
                         &mut values.into_iter().peekmore(),
                         scope,
                         super_selector,
                         String::new(),
-                        tok.unwrap().pos,
+                        tok.pos,
                     )?;
                     return Ok(Some(Spanned {
                         node: Style::from_tokens(toks, scope, super_selector, prop)?,
                         span,
                     }));
-                } else {
-                    values.push(tok.unwrap());
                 }
             }
             ';' => {

src/style.rs

@@ -199,19 +199,21 @@ impl<'a> StyleParser<'a> {
         span_before: Span,
     ) -> SassResult<String> {
         devour_whitespace(toks);
-        let property = eat_ident(toks, self.scope, self.super_selector, span_before)?.node;
+        let property = eat_ident(toks, self.scope, self.super_selector, span_before)?;
         devour_whitespace_or_comment(toks)?;
         if toks.peek().is_some() && toks.peek().unwrap().kind == ':' {
             toks.next();
             devour_whitespace_or_comment(toks)?;
+        } else {
+            return Err(("Expected \":\".", property.span).into());
         }
 
         if super_property.is_empty() {
-            Ok(property)
+            Ok(property.node)
         } else {
-            super_property.reserve(1 + property.len());
+            super_property.reserve(1 + property.node.len());
             super_property.push('-');
-            super_property.push_str(&property);
+            super_property.push_str(&property.node);
             Ok(super_property)
         }
     }

tests/error.rs

@@ -62,3 +62,7 @@ error!(
     nothing_after_at_sign,
     "a {color: red; @", "Error: Expected identifier."
 );
+error!(
+    missing_colon_in_style,
+    "a {color, red;}", "Error: Expected \":\"."
+);