tests/ui/lint/unused/unused-allocation.rs


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#![feature(rustc_attrs, stmt_expr_attributes)]
#![deny(unused_allocation)]

fn main() {
    _ = (#[rustc_box] Box::new([1])).len(); //~ error: unnecessary allocation, use `&` instead
    _ = Box::new([1]).len(); //~ error: unnecessary allocation, use `&` instead
}