#![allow(bare_trait_objects)] trait Trait {} fn f<'a, T: Trait + ('a)>() {} //~ ERROR parenthesized lifetime bounds are not supported fn check<'a>() { let _: Box; //~ ERROR parenthesized lifetime bounds are not supported let _: Box<('a) + Trait>; //~ ERROR lifetime in trait object type must be followed by `+` } fn main() {}