pub const RetTy = packed struct(u32) body_len: u310 means void. 1 means the type is a simple Ref. Otherwise, the length of a trailing body.
is_generic: boolWhether the return type is generic, i.e. refers to one or more previous parameters.
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2628 pub const RetTy = packed struct(u32) {
/// 0 means `void`.
/// 1 means the type is a simple `Ref`.
/// Otherwise, the length of a trailing body.
body_len: u31,
/// Whether the return type is generic, i.e. refers to one or more previous parameters.
is_generic: bool,
}