Function CFStringConvertEncodingToIANACharSetName 

pub extern "C-unwind" fn CFStringConvertEncodingToIANACharSetName(
    encoding: CFStringEncoding,
) -> Option<CFRetained<CFString>>

👎Deprecated: renamed to CFString::convert_encoding_to_iana_char_set_name

Available on crate feature CFString only.