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Improve handling of trait bounds when deriving fmap-like traits
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12 changed files with 229 additions and 136 deletions
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@ -27,17 +27,18 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
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computations.append_all(bindings_pairs.map(|(binding, mapped_binding)| {
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let field_attrs = cg::parse_field_attrs::<AnimateFieldAttrs>(&binding.field);
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if field_attrs.constant {
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if cg::is_parameterized(&binding.field.ty, where_clause.params) {
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if cg::is_parameterized(&binding.field.ty, where_clause.params, None) {
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where_clause.inner.predicates.push(cg::where_predicate(
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binding.field.ty.clone(),
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&["std", "clone", "Clone"],
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None,
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));
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}
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quote! {
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let #mapped_binding = ::std::clone::Clone::clone(#binding);
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}
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} else {
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where_clause.add_trait_bound(binding.field.ty.clone());
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where_clause.add_trait_bound(&binding.field.ty);
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quote! {
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let #mapped_binding =
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::values::animated::ToAnimatedZero::to_animated_zero(#binding)?;
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