mirror of https://github.com/rust-lang/rust.git
25 lines
575 B
Rust
25 lines
575 B
Rust
//@ revisions: current next
|
|
//@ ignore-compare-mode-next-solver (explicit revisions)
|
|
//@[next] compile-flags: -Znext-solver
|
|
//@ reference: attributes.diagnostic.do_not_recommend.intro
|
|
|
|
trait Root {}
|
|
trait DontRecommend {}
|
|
trait Other {}
|
|
trait Child {}
|
|
|
|
#[diagnostic::do_not_recommend]
|
|
impl<T> Root for T where T: DontRecommend {}
|
|
|
|
impl<T> DontRecommend for T where T: Other {}
|
|
|
|
#[diagnostic::do_not_recommend]
|
|
impl<T> Other for T where T: Child {}
|
|
|
|
fn needs_root<T: Root>() {}
|
|
|
|
fn main() {
|
|
needs_root::<()>();
|
|
//~^ ERROR the trait bound `(): Root` is not satisfied
|
|
}
|