| // This test checks that the lint `if_let_rescope` only actions |
| // when the feature gate is enabled. |
| // Edition 2021 is used here because the lint should work especially |
| // when edition migration towards 2024 is run. |
| |
| //@ revisions: with_feature_gate without_feature_gate |
| //@ [without_feature_gate] check-pass |
| //@ edition: 2021 |
| |
| #![cfg_attr(with_feature_gate, feature(if_let_rescope))] |
| #![deny(if_let_rescope)] |
| #![allow(irrefutable_let_patterns)] |
| |
| struct Droppy; |
| impl Drop for Droppy { |
| fn drop(&mut self) { |
| println!("dropped"); |
| } |
| } |
| impl Droppy { |
| fn get(&self) -> Option<u8> { |
| None |
| } |
| } |
| |
| fn main() { |
| if let Some(_value) = Droppy.get() { |
| //[with_feature_gate]~^ ERROR: `if let` assigns a shorter lifetime since Edition 2024 |
| //[with_feature_gate]~| HELP: a `match` with a single arm can preserve the drop order up to Edition 2021 |
| //[with_feature_gate]~| WARN: this changes meaning in Rust 2024 |
| } else { |
| //[with_feature_gate]~^ HELP: the value is now dropped here in Edition 2024 |
| } |
| } |
