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The C-variadic type `...` has been nested inside another type.
Erroneous code example:
```compile_fail,E0743
#![feature(c_variadic)]
fn foo2(x: u8, y: &...) {} // error!
```
Only foreign functions can use the C-variadic type (`...`). In such functions,
`...` may only occur non-nested. That is, `y: &'a ...` is not allowed.
A C-variadic type is used to give an undefined number of parameters to a given
function (like `printf` in C). The equivalent in Rust would be to use macros
directly (like `println!` for example).
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