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#![feature(const_fn)] const X : usize = 2; const fn f(x: usize) -> usize { let mut sum = 0; for i in 0..x { //~^ ERROR E0015 //~| ERROR E0019 //~| ERROR E0080 sum += i; } sum } #[allow(unused_variables)] fn main() { let a : [i32; f(X)]; }