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#![allow(unused, incomplete_features)]
#![warn(clippy::large_stack_frames)]
#![feature(unsized_locals)]
use std::hint::black_box;
fn generic<T: Default>() {
let x = T::default();
black_box(&x);
}
fn unsized_local() {
let x: dyn std::fmt::Display = *(Box::new(1) as Box<dyn std::fmt::Display>);
black_box(&x);
}
struct ArrayDefault<const N: usize>([u8; N]);
impl<const N: usize> Default for ArrayDefault<N> {
fn default() -> Self {
Self([0; N])
}
}
fn many_small_arrays() {
//~^ ERROR: this function allocates a large amount of stack space
//~| NOTE: allocating large amounts of stack space can overflow the stack
let x = [0u8; 500_000];
let x2 = [0u8; 500_000];
let x3 = [0u8; 500_000];
let x4 = [0u8; 500_000];
let x5 = [0u8; 500_000];
black_box((&x, &x2, &x3, &x4, &x5));
}
fn large_return_value() -> ArrayDefault<1_000_000> {
//~^ ERROR: this function allocates a large amount of stack space
//~| NOTE: allocating large amounts of stack space can overflow the stack
Default::default()
}
fn large_fn_arg(x: ArrayDefault<1_000_000>) {
//~^ ERROR: this function allocates a large amount of stack space
//~| NOTE: allocating large amounts of stack space can overflow the stack
black_box(&x);
}
fn main() {
generic::<ArrayDefault<1_000_000>>();
}
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