🚸 Improve error message

Author: phoenixr-codes

powercli/command.py

@@ -485,7 +485,9 @@ def parse_args(self, args: list[str] | None = None) -> parser.ParsedCommand[FV,
                 if done_parsing_variadics and isinstance(
                     positional, VariadicPositional
                 ):
-                    raise RuntimeError("unexpected argument")  # TODO: improve error
+                    raise RuntimeError(
+                        "unexpected argument; flags must not be used between variadic positionals"
+                    )
                 if variadic_pos_values or isinstance(positional, VariadicPositional):
                     variadic_pos_values.append(value)
                     continue