File: unconstrained_const_param_on_drop.rs

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rustc 1.89.0%2Bdfsg1-1
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struct Foo {}

impl<const UNUSED: usize> Drop for Foo {}
//~^ ERROR: `Drop` impl requires `the constant `_` has type `usize``
//~| ERROR: the const parameter `UNUSED` is not constrained by the impl trait, self type, or predicates

fn main() {}