rust/tests/ui/proc-macro/derive-helper-legacy-limits.rs
2023-01-11 09:32:08 +00:00

22 lines
478 B
Rust

// Support for legacy derive helpers is limited and heuristic-based
// (that's exactly the reason why they are deprecated).
// edition:2018
// aux-build:test-macros.rs
#[macro_use]
extern crate test_macros;
use derive as my_derive;
#[my_derive(Empty)]
#[empty_helper] // OK
struct S1;
// Legacy helper detection doesn't see through `derive` renaming.
#[empty_helper] //~ ERROR cannot find attribute `empty_helper` in this scope
#[my_derive(Empty)]
struct S2;
fn main() {}