rust armanriazi error cannot be formatted using `{:?}`

The error message you mentioned, "cannot be formatted using {:?}," typically occurs when there is an issue with formatting a value using the {:?} format specifier in Rust.

The {:?} format specifier is used to format a value using the Debug trait, which provides a default implementation for printing a value in a debug format. However, not all types can be formatted using {:?}.

To resolve this error, you have a few options:

1. Implement the Debug trait for your custom type: If you have a custom type that cannot be formatted using {:?}, you can implement the Debug trait for that type. This involves implementing the fmt::Debug trait for your type, which specifies how the type should be formatted in debug mode. Once you've implemented the Debug trait, you should be able to format your type using {:?}.

2. Use a different format specifier: If you are trying to format a value using {:?} and it's not working, you can try using a different format specifier that is appropriate for the type you are working with. Rust provides various format specifiers, such as {}, %d, %f, etc., which can be used to format different types of values.

3. Convert the value to a compatible type: If you are trying to format a value that is not compatible with {:?}, you can try converting it to a compatible type before formatting. For example, if you have a value of a custom type that does not implement Debug, you can convert it to a string or another type that can be formatted using {:?}.

By following these suggestions, you should be able to resolve the "cannot be formatted using {:?}" error in Rust.