218 lines
6.2 KiB
Rust
218 lines
6.2 KiB
Rust
#![allow(clippy::wrong_self_convention)]
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use std::iter::FromIterator;
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use std::ops::{Deref, DerefMut};
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use std::result::Result as StdResult;
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use crate::error::Result;
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use crate::lua::Lua;
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use crate::value::{FromLua, FromLuaMulti, MultiValue, Nil, ToLua, ToLuaMulti};
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/// Result is convertible to `MultiValue` following the common Lua idiom of returning the result
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/// on success, or in the case of an error, returning `nil` and an error message.
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impl<'lua, T: ToLua<'lua>, E: ToLua<'lua>> ToLuaMulti<'lua> for StdResult<T, E> {
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fn to_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>> {
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let mut result = MultiValue::new();
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match self {
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Ok(v) => result.push_front(v.to_lua(lua)?),
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Err(e) => {
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result.push_front(e.to_lua(lua)?);
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result.push_front(Nil);
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}
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}
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Ok(result)
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}
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}
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impl<'lua, T: ToLua<'lua>> ToLuaMulti<'lua> for T {
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fn to_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>> {
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let mut v = MultiValue::new();
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v.push_front(self.to_lua(lua)?);
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Ok(v)
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}
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}
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impl<'lua, T: FromLua<'lua>> FromLuaMulti<'lua> for T {
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fn from_lua_multi(mut values: MultiValue<'lua>, lua: &'lua Lua) -> Result<Self> {
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T::from_lua(values.pop_front().unwrap_or(Nil), lua)
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}
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}
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impl<'lua> ToLuaMulti<'lua> for MultiValue<'lua> {
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fn to_lua_multi(self, _: &'lua Lua) -> Result<MultiValue<'lua>> {
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Ok(self)
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}
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}
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impl<'lua> FromLuaMulti<'lua> for MultiValue<'lua> {
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fn from_lua_multi(values: MultiValue<'lua>, _: &'lua Lua) -> Result<Self> {
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Ok(values)
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}
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}
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/// Wraps a variable number of `T`s.
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///
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/// Can be used to work with variadic functions more easily. Using this type as the last argument of
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/// a Rust callback will accept any number of arguments from Lua and convert them to the type `T`
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/// using [`FromLua`]. `Variadic<T>` can also be returned from a callback, returning a variable
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/// number of values to Lua.
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///
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/// The [`MultiValue`] type is equivalent to `Variadic<Value>`.
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///
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/// # Examples
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///
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/// ```
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/// # use mlua::{Lua, Result, Variadic};
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/// # fn main() -> Result<()> {
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/// # let lua = Lua::new();
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/// let add = lua.create_function(|_, vals: Variadic<f64>| -> Result<f64> {
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/// Ok(vals.iter().sum())
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/// })?;
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/// lua.globals().set("add", add)?;
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/// assert_eq!(lua.load("add(3, 2, 5)").eval::<f32>()?, 10.0);
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/// # Ok(())
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/// # }
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/// ```
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///
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/// [`FromLua`]: trait.FromLua.html
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/// [`MultiValue`]: struct.MultiValue.html
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#[derive(Debug, Clone)]
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pub struct Variadic<T>(Vec<T>);
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impl<T> Variadic<T> {
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/// Creates an empty `Variadic` wrapper containing no values.
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pub fn new() -> Variadic<T> {
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Variadic(Vec::new())
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}
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}
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impl<T> Default for Variadic<T> {
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fn default() -> Variadic<T> {
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Variadic::new()
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}
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}
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impl<T> FromIterator<T> for Variadic<T> {
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fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
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Variadic(Vec::from_iter(iter))
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}
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}
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impl<T> IntoIterator for Variadic<T> {
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type Item = T;
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type IntoIter = <Vec<T> as IntoIterator>::IntoIter;
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fn into_iter(self) -> Self::IntoIter {
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self.0.into_iter()
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}
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}
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impl<T> Deref for Variadic<T> {
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type Target = Vec<T>;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl<T> DerefMut for Variadic<T> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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}
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}
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impl<'lua, T: ToLua<'lua>> ToLuaMulti<'lua> for Variadic<T> {
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fn to_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>> {
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self.0.into_iter().map(|e| e.to_lua(lua)).collect()
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}
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}
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impl<'lua, T: FromLua<'lua>> FromLuaMulti<'lua> for Variadic<T> {
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fn from_lua_multi(values: MultiValue<'lua>, lua: &'lua Lua) -> Result<Self> {
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values
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.into_iter()
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.map(|e| T::from_lua(e, lua))
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.collect::<Result<Vec<T>>>()
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.map(Variadic)
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}
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}
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macro_rules! impl_tuple {
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() => (
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impl<'lua> ToLuaMulti<'lua> for () {
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fn to_lua_multi(self, _: &'lua Lua) -> Result<MultiValue<'lua>> {
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Ok(MultiValue::new())
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}
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}
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impl<'lua> FromLuaMulti<'lua> for () {
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fn from_lua_multi(_: MultiValue<'lua>, _: &'lua Lua) -> Result<Self> {
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Ok(())
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}
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}
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);
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($last:ident $($name:ident)*) => (
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impl<'lua, $($name,)* $last> ToLuaMulti<'lua> for ($($name,)* $last,)
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where $($name: ToLua<'lua>,)*
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$last: ToLuaMulti<'lua>
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{
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#[allow(unused_mut)]
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#[allow(non_snake_case)]
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fn to_lua_multi(self, lua: &'lua Lua) -> Result<MultiValue<'lua>> {
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let ($($name,)* $last,) = self;
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let mut results = $last.to_lua_multi(lua)?;
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push_reverse!(results, $($name.to_lua(lua)?,)*);
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Ok(results)
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}
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}
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impl<'lua, $($name,)* $last> FromLuaMulti<'lua> for ($($name,)* $last,)
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where $($name: FromLua<'lua>,)*
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$last: FromLuaMulti<'lua>
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{
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#[allow(unused_mut)]
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#[allow(non_snake_case)]
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fn from_lua_multi(mut values: MultiValue<'lua>, lua: &'lua Lua) -> Result<Self> {
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$(let $name = values.pop_front().unwrap_or(Nil);)*
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let $last = FromLuaMulti::from_lua_multi(values, lua)?;
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Ok(($(FromLua::from_lua($name, lua)?,)* $last,))
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}
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}
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);
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}
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macro_rules! push_reverse {
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($multi_value:expr, $first:expr, $($rest:expr,)*) => (
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push_reverse!($multi_value, $($rest,)*);
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$multi_value.push_front($first);
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);
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($multi_value:expr, $first:expr) => (
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$multi_value.push_front($first);
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);
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($multi_value:expr,) => ();
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}
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impl_tuple!();
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impl_tuple!(A);
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impl_tuple!(A B);
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impl_tuple!(A B C);
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impl_tuple!(A B C D);
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impl_tuple!(A B C D E);
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impl_tuple!(A B C D E F);
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impl_tuple!(A B C D E F G);
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impl_tuple!(A B C D E F G H);
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impl_tuple!(A B C D E F G H I);
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impl_tuple!(A B C D E F G H I J);
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impl_tuple!(A B C D E F G H I J K);
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impl_tuple!(A B C D E F G H I J K L);
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impl_tuple!(A B C D E F G H I J K L M);
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impl_tuple!(A B C D E F G H I J K L M N);
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impl_tuple!(A B C D E F G H I J K L M N O);
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impl_tuple!(A B C D E F G H I J K L M N O P);
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