#![feature(generic_arg_infer)] struct All<'a, T, const N: usize> { v: &'a T, } struct BadInfer<_>; //~^ ERROR expected identifier //~| ERROR parameter `_` is never used fn all_fn<'a, T, const N: usize>() {} fn bad_infer_fn<_>() {} //~^ ERROR expected identifier fn main() { let a: All<_, _, _>; all_fn(); let v: [u8; _]; let v: [u8; 10] = [0; _]; }