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use crate::de::Parameters;
use crate::fragment::Fragment;
use crate::internals::attr;
use crate::private;
use quote::quote;
/// Generates `Deserialize::deserialize` body for a `struct Unit;`
pub(super) fn deserialize(params: &Parameters, cattrs: &attr::Container) -> Fragment {
let this_type = ¶ms.this_type;
let this_value = ¶ms.this_value;
let type_name = cattrs.name().deserialize_name();
let (de_impl_generics, de_ty_generics, ty_generics, where_clause) =
params.generics_with_de_lifetime();
let delife = params.borrowed.de_lifetime();
let expecting = format!("unit struct {}", params.type_name());
let expecting = cattrs.expecting().unwrap_or(&expecting);
quote_block! {
#[doc(hidden)]
struct __Visitor #de_impl_generics #where_clause {
marker: _serde::#private::PhantomData<#this_type #ty_generics>,
lifetime: _serde::#private::PhantomData<&#delife ()>,
}
#[automatically_derived]
impl #de_impl_generics _serde::de::Visitor<#delife> for __Visitor #de_ty_generics #where_clause {
type Value = #this_type #ty_generics;
fn expecting(&self, __formatter: &mut _serde::#private::Formatter) -> _serde::#private::fmt::Result {
_serde::#private::Formatter::write_str(__formatter, #expecting)
}
#[inline]
fn visit_unit<__E>(self) -> _serde::#private::Result<Self::Value, __E>
where
__E: _serde::de::Error,
{
_serde::#private::Ok(#this_value)
}
}
_serde::Deserializer::deserialize_unit_struct(
__deserializer,
#type_name,
__Visitor {
marker: _serde::#private::PhantomData::<#this_type #ty_generics>,
lifetime: _serde::#private::PhantomData,
},
)
}
}