4c4b61b730
Implicit deref patterns allow previously ill-typed programs. Make sure they're still ill-typed without the feature gate. I've thrown in a test for `deref!(_)` too, though it seems it refers to `deref_patterns` as a library feature.
29 lines
1.1 KiB
Text
29 lines
1.1 KiB
Text
error[E0658]: use of unstable library feature `deref_patterns`: placeholder syntax for deref patterns
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--> $DIR/needs-gate.rs:5:9
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LL | deref!(0) => {}
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| ^^^^^
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= note: see issue #87121 <https://github.com/rust-lang/rust/issues/87121> for more information
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= help: add `#![feature(deref_patterns)]` to the crate attributes to enable
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= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
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error[E0308]: mismatched types
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--> $DIR/needs-gate.rs:11:9
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LL | match Box::new(0) {
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| ----------- this expression has type `Box<{integer}>`
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LL | 0 => {}
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| ^ expected `Box<{integer}>`, found integer
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= note: expected struct `Box<{integer}>`
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found type `{integer}`
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help: consider dereferencing to access the inner value using the Deref trait
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LL | match *Box::new(0) {
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| +
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error: aborting due to 2 previous errors
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Some errors have detailed explanations: E0308, E0658.
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For more information about an error, try `rustc --explain E0308`.
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