use std::mem::size_of; struct Foo<'s> { //~ ERROR: parameter `'s` is never used array: [(); size_of::<&Self>()], //~^ ERROR: generic `Self` types are currently not permitted in anonymous constants } // The below is taken from https://github.com/rust-lang/rust/issues/66152#issuecomment-550275017 // as the root cause seems the same. const fn foo() -> usize { 0 } struct Bar<'a> { //~ ERROR: parameter `'a` is never used beta: [(); foo::<&'a ()>()], //~ ERROR: generic parameters may not be used in const operations } fn main() {}