struct A<T>{a: i32, b: i64, c: T}

cargo-expand.rs

#![feature(prelude_import)]
#[prelude_import]
use std::prelude::v1::*;
#[macro_use]
extern crate std;
use serde::{Deserialize, Serialize};
struct A<T> {
    a: i32,
    b: i64,
    c: T,
}
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_SERIALIZE_FOR_A: () = {
    #[allow(unknown_lints)]
    #[allow(rust_2018_idioms)]
    extern crate serde as _serde;
    #[allow(unused_macros)]
    macro_rules! try {
        ($ __expr : expr) => {
            match $__expr {
                _serde::export::Ok(__val) => __val,
                _serde::export::Err(__err) => {
                    return _serde::export::Err(__err);
                }
            }
        };
    }
    #[automatically_derived]
    impl<T> _serde::Serialize for A<T>
    where
        T: _serde::Serialize,
    {
        fn serialize<__S>(&self, __serializer: __S) -> _serde::export::Result<__S::Ok, __S::Error>
        where
            __S: _serde::Serializer,
        {
            let mut __serde_state = match _serde::Serializer::serialize_struct(
                __serializer,
                "A",
                false as usize + 1 + 1 + 1,
            ) {
                _serde::export::Ok(__val) => __val,
                _serde::export::Err(__err) => {
                    return _serde::export::Err(__err);
                }
            };
            match _serde::ser::SerializeStruct::serialize_field(&mut __serde_state, "a", &self.a) {
                _serde::export::Ok(__val) => __val,
                _serde::export::Err(__err) => {
                    return _serde::export::Err(__err);
                }
            };
            match _serde::ser::SerializeStruct::serialize_field(&mut __serde_state, "b", &self.b) {
                _serde::export::Ok(__val) => __val,
                _serde::export::Err(__err) => {
                    return _serde::export::Err(__err);
                }
            };
            match _serde::ser::SerializeStruct::serialize_field(&mut __serde_state, "c", &self.c) {
                _serde::export::Ok(__val) => __val,
                _serde::export::Err(__err) => {
                    return _serde::export::Err(__err);
                }
            };
            _serde::ser::SerializeStruct::end(__serde_state)
        }
    }
};
#[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
const _IMPL_DESERIALIZE_FOR_A: () = {
    #[allow(unknown_lints)]
    #[allow(rust_2018_idioms)]
    extern crate serde as _serde;
    #[allow(unused_macros)]
    macro_rules! try {
        ($ __expr : expr) => {
            match $__expr {
                _serde::export::Ok(__val) => __val,
                _serde::export::Err(__err) => {
                    return _serde::export::Err(__err);
                }
            }
        };
    }
    #[automatically_derived]
    impl<'de, T> _serde::Deserialize<'de> for A<T>
    where
        T: _serde::Deserialize<'de>,
    {
        fn deserialize<__D>(__deserializer: __D) -> _serde::export::Result<Self, __D::Error>
        where
            __D: _serde::Deserializer<'de>,
        {
            #[allow(non_camel_case_types)]
            enum __Field {
                __field0,
                __field1,
                __field2,
                __ignore,
            }
            struct __FieldVisitor;
            impl<'de> _serde::de::Visitor<'de> for __FieldVisitor {
                type Value = __Field;
                fn expecting(
                    &self,
                    __formatter: &mut _serde::export::Formatter,
                ) -> _serde::export::fmt::Result {
                    _serde::export::Formatter::write_str(__formatter, "field identifier")
                }
                fn visit_u64<__E>(self, __value: u64) -> _serde::export::Result<Self::Value, __E>
                where
                    __E: _serde::de::Error,
                {
                    match __value {
                        0u64 => _serde::export::Ok(__Field::__field0),
                        1u64 => _serde::export::Ok(__Field::__field1),
                        2u64 => _serde::export::Ok(__Field::__field2),
                        _ => _serde::export::Err(_serde::de::Error::invalid_value(
                            _serde::de::Unexpected::Unsigned(__value),
                            &"field index 0 <= i < 3",
                        )),
                    }
                }
                fn visit_str<__E>(self, __value: &str) -> _serde::export::Result<Self::Value, __E>
                where
                    __E: _serde::de::Error,
                {
                    match __value {
                        "a" => _serde::export::Ok(__Field::__field0),
                        "b" => _serde::export::Ok(__Field::__field1),
                        "c" => _serde::export::Ok(__Field::__field2),
                        _ => _serde::export::Ok(__Field::__ignore),
                    }
                }
                fn visit_bytes<__E>(
                    self,
                    __value: &[u8],
                ) -> _serde::export::Result<Self::Value, __E>
                where
                    __E: _serde::de::Error,
                {
                    match __value {
                        b"a" => _serde::export::Ok(__Field::__field0),
                        b"b" => _serde::export::Ok(__Field::__field1),
                        b"c" => _serde::export::Ok(__Field::__field2),
                        _ => _serde::export::Ok(__Field::__ignore),
                    }
                }
            }
            impl<'de> _serde::Deserialize<'de> for __Field {
                #[inline]
                fn deserialize<__D>(__deserializer: __D) -> _serde::export::Result<Self, __D::Error>
                where
                    __D: _serde::Deserializer<'de>,
                {
                    _serde::Deserializer::deserialize_identifier(__deserializer, __FieldVisitor)
                }
            }
            struct __Visitor<'de, T>
            where
                T: _serde::Deserialize<'de>,
            {
                marker: _serde::export::PhantomData<A<T>>,
                lifetime: _serde::export::PhantomData<&'de ()>,
            }
            impl<'de, T> _serde::de::Visitor<'de> for __Visitor<'de, T>
            where
                T: _serde::Deserialize<'de>,
            {
                type Value = A<T>;
                fn expecting(
                    &self,
                    __formatter: &mut _serde::export::Formatter,
                ) -> _serde::export::fmt::Result {
                    _serde::export::Formatter::write_str(__formatter, "struct A")
                }
                #[inline]
                fn visit_seq<__A>(
                    self,
                    mut __seq: __A,
                ) -> _serde::export::Result<Self::Value, __A::Error>
                where
                    __A: _serde::de::SeqAccess<'de>,
                {
                    let __field0 =
                        match match _serde::de::SeqAccess::next_element::<i32>(&mut __seq) {
                            _serde::export::Ok(__val) => __val,
                            _serde::export::Err(__err) => {
                                return _serde::export::Err(__err);
                            }
                        } {
                            _serde::export::Some(__value) => __value,
                            _serde::export::None => {
                                return _serde::export::Err(_serde::de::Error::invalid_length(
                                    0usize,
                                    &"struct A with 3 elements",
                                ));
                            }
                        };
                    let __field1 =
                        match match _serde::de::SeqAccess::next_element::<i64>(&mut __seq) {
                            _serde::export::Ok(__val) => __val,
                            _serde::export::Err(__err) => {
                                return _serde::export::Err(__err);
                            }
                        } {
                            _serde::export::Some(__value) => __value,
                            _serde::export::None => {
                                return _serde::export::Err(_serde::de::Error::invalid_length(
                                    1usize,
                                    &"struct A with 3 elements",
                                ));
                            }
                        };
                    let __field2 = match match _serde::de::SeqAccess::next_element::<T>(&mut __seq)
                    {
                        _serde::export::Ok(__val) => __val,
                        _serde::export::Err(__err) => {
                            return _serde::export::Err(__err);
                        }
                    } {
                        _serde::export::Some(__value) => __value,
                        _serde::export::None => {
                            return _serde::export::Err(_serde::de::Error::invalid_length(
                                2usize,
                                &"struct A with 3 elements",
                            ));
                        }
                    };
                    _serde::export::Ok(A {
                        a: __field0,
                        b: __field1,
                        c: __field2,
                    })
                }
                #[inline]
                fn visit_map<__A>(
                    self,
                    mut __map: __A,
                ) -> _serde::export::Result<Self::Value, __A::Error>
                where
                    __A: _serde::de::MapAccess<'de>,
                {
                    let mut __field0: _serde::export::Option<i32> = _serde::export::None;
                    let mut __field1: _serde::export::Option<i64> = _serde::export::None;
                    let mut __field2: _serde::export::Option<T> = _serde::export::None;
                    while let _serde::export::Some(__key) =
                        match _serde::de::MapAccess::next_key::<__Field>(&mut __map) {
                            _serde::export::Ok(__val) => __val,
                            _serde::export::Err(__err) => {
                                return _serde::export::Err(__err);
                            }
                        }
                    {
                        match __key {
                            __Field::__field0 => {
                                if _serde::export::Option::is_some(&__field0) {
                                    return _serde::export::Err(
                                        <__A::Error as _serde::de::Error>::duplicate_field("a"),
                                    );
                                }
                                __field0 = _serde::export::Some(
                                    match _serde::de::MapAccess::next_value::<i32>(&mut __map) {
                                        _serde::export::Ok(__val) => __val,
                                        _serde::export::Err(__err) => {
                                            return _serde::export::Err(__err);
                                        }
                                    },
                                );
                            }
                            __Field::__field1 => {
                                if _serde::export::Option::is_some(&__field1) {
                                    return _serde::export::Err(
                                        <__A::Error as _serde::de::Error>::duplicate_field("b"),
                                    );
                                }
                                __field1 = _serde::export::Some(
                                    match _serde::de::MapAccess::next_value::<i64>(&mut __map) {
                                        _serde::export::Ok(__val) => __val,
                                        _serde::export::Err(__err) => {
                                            return _serde::export::Err(__err);
                                        }
                                    },
                                );
                            }
                            __Field::__field2 => {
                                if _serde::export::Option::is_some(&__field2) {
                                    return _serde::export::Err(
                                        <__A::Error as _serde::de::Error>::duplicate_field("c"),
                                    );
                                }
                                __field2 = _serde::export::Some(
                                    match _serde::de::MapAccess::next_value::<T>(&mut __map) {
                                        _serde::export::Ok(__val) => __val,
                                        _serde::export::Err(__err) => {
                                            return _serde::export::Err(__err);
                                        }
                                    },
                                );
                            }
                            _ => {
                                let _ = match _serde::de::MapAccess::next_value::<
                                    _serde::de::IgnoredAny,
                                >(&mut __map)
                                {
                                    _serde::export::Ok(__val) => __val,
                                    _serde::export::Err(__err) => {
                                        return _serde::export::Err(__err);
                                    }
                                };
                            }
                        }
                    }
                    let __field0 = match __field0 {
                        _serde::export::Some(__field0) => __field0,
                        _serde::export::None => match _serde::private::de::missing_field("a") {
                            _serde::export::Ok(__val) => __val,
                            _serde::export::Err(__err) => {
                                return _serde::export::Err(__err);
                            }
                        },
                    };
                    let __field1 = match __field1 {
                        _serde::export::Some(__field1) => __field1,
                        _serde::export::None => match _serde::private::de::missing_field("b") {
                            _serde::export::Ok(__val) => __val,
                            _serde::export::Err(__err) => {
                                return _serde::export::Err(__err);
                            }
                        },
                    };
                    let __field2 = match __field2 {
                        _serde::export::Some(__field2) => __field2,
                        _serde::export::None => match _serde::private::de::missing_field("c") {
                            _serde::export::Ok(__val) => __val,
                            _serde::export::Err(__err) => {
                                return _serde::export::Err(__err);
                            }
                        },
                    };
                    _serde::export::Ok(A {
                        a: __field0,
                        b: __field1,
                        c: __field2,
                    })
                }
            }
            const FIELDS: &'static [&'static str] = &["a", "b", "c"];
            _serde::Deserializer::deserialize_struct(
                __deserializer,
                "A",
                FIELDS,
                __Visitor {
                    marker: _serde::export::PhantomData::<A<T>>,
                    lifetime: _serde::export::PhantomData,
                },
            )
        }
    }
};
fn main() {}