#![feature(const_trait_impl)] #![feature(const_mut_refs)] struct A(); impl const Drop for A { //~^ ERROR const `impl` for trait `Drop` which is not marked with `#[const_trait]` fn drop(&mut self) {} } const C: A = A(); fn main() { let _: &'static A = &A(); //~ ERROR temporary value dropped while borrowed let _: &'static [A] = &[C]; //~ ERROR temporary value dropped while borrowed }