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Improve handling of trait bounds when deriving fmap-like traits

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This commit is contained in:
Anthony Ramine 2017-08-26 12:40:28 +02:00
parent 8101887d31
commit efc852f6e3
12 changed files with 229 additions and 136 deletions
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5
components/style_derive/to_animated_zero.rs
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@ -27,17 +27,18 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
computations.append_all(bindings_pairs.map(|(binding, mapped_binding)| {
let field_attrs = cg::parse_field_attrs::<AnimateFieldAttrs>(&binding.field);
if field_attrs.constant {
if cg::is_parameterized(&binding.field.ty, where_clause.params) {
if cg::is_parameterized(&binding.field.ty, where_clause.params, None) {
where_clause.inner.predicates.push(cg::where_predicate(
binding.field.ty.clone(),
&["std", "clone", "Clone"],
None,
));
}
quote! {
let #mapped_binding = ::std::clone::Clone::clone(#binding);
}
} else {
where_clause.add_trait_bound(binding.field.ty.clone());
where_clause.add_trait_bound(&binding.field.ty);
quote! {
let #mapped_binding =
::values::animated::ToAnimatedZero::to_animated_zero(#binding)?;