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error: constant of non-structural type `Vec<u8>` in a pattern
--> $DIR/issue-115599.rs:5:12
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LL | const CONST_STRING: String = String::new();
| -------------------------- constant defined here
...
LL | if let CONST_STRING = empty_str {}
| ^^^^^^^^^^^^ constant of non-structural type
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--> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
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= note: `Vec<u8>` 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
error: aborting due to 1 previous error
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