Add escaped backslash

src/tokens.cpp

@@ -21,6 +21,8 @@ static std::optional<char> get_escaped(std::string_view inspected) {
         return '\r';
     if (inspected == "t")
         return '\t';
+    if (inspected == "\\")
+        return '\\';
     if (inspected.size() <= 3) {
         for (char c : inspected) {
             std::cout << c << std::endl;