- write!(&mut arg_conv, "let arg_conv = ").unwrap();
- types.write_from_c_conversion_prefix(&mut arg_conv, &args_ty, Some(generics));
- write!(&mut arg_conv, "arg").unwrap();
- types.write_from_c_conversion_suffix(&mut arg_conv, &args_ty, Some(generics));
+ if let syn::Type::Tuple(tup) = args_ty {
+ // Crack open tuples and make them separate arguments instead of
+ // converting the full tuple. This makes it substantially easier to
+ // reason about things like references in the tuple fields.
+ let mut arg_conv_res = Vec::new();
+ for (idx, elem) in tup.elems.iter().enumerate() {
+ let arg_name = format!("arg_{}", ('a' as u8 + idx as u8) as char);
+ write_arg_conv!(elem, arg_name);
+ write!(&mut arg_conv_res, "{}_conv{}", arg_name, if idx != tup.elems.len() - 1 { ", " } else { "" }).unwrap();
+ }
+ writeln!(&mut arg_conv, "\tlet arg_conv = ({});", String::from_utf8(arg_conv_res).unwrap()).unwrap();
+ } else {
+ write_arg_conv!(args_ty, "arg");
+ }