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- 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 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```
17 lines
573 B
Plaintext
17 lines
573 B
Plaintext
error: constant of non-structural type `Cow<'_, str>` in a pattern
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--> $DIR/issue-89088.rs:16:9
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LL | const FOO: &A = &A::Field(Cow::Borrowed("foo"));
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| ------------- constant defined here
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...
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LL | FOO => todo!(),
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| ^^^ constant of non-structural type
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--> $SRC_DIR/alloc/src/borrow.rs:LL:COL
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= note: `Cow<'_, str>` must be annotated with `#[derive(PartialEq)]` to be usable in patterns
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= note: see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details
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error: aborting due to 1 previous error
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