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