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335d05aee5
- Point at type that should derive `PartialEq` to be structural.
- Point at manual `impl PartialEq`, explaining that it is not sufficient to be structural.
```
error: constant of non-structural type `MyType` in a pattern
--> $DIR/const-partial_eq-fallback-ice.rs:14:12
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LL | struct MyType;
| ------------- `MyType` must be annotated with `#[derive(PartialEq)]` to be usable in patterns
...
LL | const CONSTANT: &&MyType = &&MyType;
| ------------------------ constant defined here
...
LL | if let CONSTANT = &&MyType {
| ^^^^^^^^ constant of non-structural type
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note: the `PartialEq` trait must be derived, manual `impl`s are not sufficient; see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details
--> $DIR/const-partial_eq-fallback-ice.rs:5:1
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LL | impl PartialEq<usize> for MyType {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```
20 lines
391 B
Rust
20 lines
391 B
Rust
// Regression test for the ICE described in #89088.
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use std::borrow::Cow;
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const FOO: &A = &A::Field(Cow::Borrowed("foo"));
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#[derive(PartialEq, Eq)]
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enum A {
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Field(Cow<'static, str>)
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}
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fn main() {
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let var = A::Field(Cow::Borrowed("bar"));
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match &var {
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FOO => todo!(), //~ ERROR constant of non-structural type `Cow<'_, str>` in a pattern
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_ => todo!()
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}
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}
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