59 use syn::{spanned::Spanned, Error};
66     fn parse(syn_attrs: &[syn::Attribute]) -> Result<Attributes, Error> {  in parse()  argument
74                 attr => return Err(Error::new(attr.span(), "Unrecognized attribute")),  in parse()
81 pub(crate) fn derive_read(name: &syn::Ident, data: &syn::DataStruct) -> Result<TokenStream, Error> {  in derive_read()  argument
89                     return Err(Error::new(v.span(), "Expected N(1) for type `u8`"));  in derive_read()
95                     return Err(Error::new(v.span(), "Expected N(2) for type `u16`"));  in derive_read()
101                     return Err(Error::new(v.span(), "`N()` attribute required"));  in derive_read()
104                     return Err(Error::new(v.span(), "Expected N(n <= 4)"));  in derive_read()
112                 _ => return Err(Error::new(v.elem.span(), "Only Byte array supported")),  in derive_read()
133 ) -> Result<TokenStream, Error> {  in derive_write()  argument
141                     return Err(Error::new(v.span(), "Expected N(1) for type `u8`"));  in derive_write()
147                     return Err(Error::new(v.span(), "Expected N(2) for type `u16`"));  in derive_write()
153                     return Err(Error::new(v.span(), "`N()` attribute required"));  in derive_write()
156                     return Err(Error::new(v.span(), "Expected N(n <= 4)"));  in derive_write()
164                 _ => return Err(Error::new(v.elem.span(), "Only Byte array supported")),  in derive_write()