handle backslash as last character in property

src/utils.rs

@@ -393,7 +393,7 @@ pub(crate) fn eat_ident<I: Iterator<Item = Token>>(
                     toks.next();
                 }
                 if n.is_empty() {
-                    let c = toks.next().unwrap().kind;
+                    let c = toks.next().ok_or("expected \"{\".")?.kind;
                     if (c == '-' && !s.is_empty()) || c.is_ascii_alphabetic() {
                         s.push(c);
                     } else {

tests/error.rs

@@ -27,3 +27,12 @@ error!(
     question_mark_inside_value,
     "a {foo: bar?}", "Error: expected \";\"."
 );
+// TODO: special parsing rules for variable names
+// error!(
+//     interpolation_in_variable_declaration,
+//     "$base-#{lor}: #036;", "Error: expected \":\"."
+// );
+error!(
+    backslash_as_last_character,
+    "a {colo\\: red;}", "Error: expected \"{\"."
+);