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Limit type bounds to associated types

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This commit is contained in:
Osspial 2018-04-10 10:53:37 -04:00
parent fd14332729
commit 2e824e9aba
1 changed files with 11 additions and 6 deletions
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17
serde_derive/src/bound.rs
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@ -64,13 +64,18 @@ where
let predicates = cont.data
.all_fields()
.flat_map(|field| {
let field_bound: Option<syn::WherePredicate> = match gen_bound_where(&field.attrs) {
true => {
let field_ty = field.ty;
let predicate: syn::WherePredicate = parse_quote!(#field_ty: #trait_bound);
Some(predicate)
let field_ty = field.ty;
let field_bound: Option<syn::WherePredicate> = match (field_ty, gen_bound_where(&field.attrs)) {
(&syn::Type::Path(ref ty_path), true) => match (ty_path.path.segments.first(), generics.params.first()) {
(Some(syn::punctuated::Pair::Punctuated(ref t, _)), Some(syn::punctuated::Pair::End(&syn::GenericParam::Type(ref generic_ty))))
if generic_ty.ident == t.ident =>
{
let predicate: syn::WherePredicate = parse_quote!(#field_ty: #trait_bound);
Some(predicate)
},
_ => None
},
false => None
(_, _) => None
};
field_bound.into_iter().chain(from_field(&field.attrs).into_iter().flat_map(|predicates| predicates.to_vec()))
});