// edition:2018 // revisions: min_tait full_tait #![feature(min_type_alias_impl_trait)] #![cfg_attr(full_tait, feature(type_alias_impl_trait))] //[full_tait]~^ WARN incomplete #![feature(impl_trait_in_bindings)] //~^ WARN the feature `impl_trait_in_bindings` is incomplete type F = impl core::future::Future; struct Bug { V1: [(); { fn concrete_use() -> F { async {} } let f: F = async { 1 }; //~^ ERROR `async` blocks are not allowed in constants //~| ERROR destructors cannot be evaluated at compile-time 1 }], } fn main() {}