File: issue-115599.stderr

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rustc 1.89.0%2Bdfsg1-1
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error: constant of non-structural type `Vec<u8>` in a pattern
  --> $DIR/issue-115599.rs:5:12
   |
LL | const CONST_STRING: String = String::new();
   | -------------------------- constant defined here
...
LL |     if let CONST_STRING = empty_str {}
   |            ^^^^^^^^^^^^ constant of non-structural type
  --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
   |
   = note: `Vec<u8>` must be annotated with `#[derive(PartialEq)]` to be usable in patterns
   |
   = note: see https://doc.rust-lang.org/stable/std/marker/trait.StructuralPartialEq.html for details

error: aborting due to 1 previous error