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Derive expansions for packed structs cause move errors because they prefer copying over borrowing since borrowing the fields of a packed struct can result in unaligned access and therefore undefined behaviour. This underlying cause of the errors, however, is not apparent to the user. We add a diagnostic note here to remedy that.
175 lines
9.9 KiB
Plaintext
175 lines
9.9 KiB
Plaintext
error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:13:16
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LL | #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Default)]
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| ----- in this derive macro expansion
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LL | struct StructA(String);
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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= note: `#[derive(Debug)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
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= note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:13:16
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LL | #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Default)]
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| --------- in this derive macro expansion
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LL | struct StructA(String);
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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= note: `#[derive(PartialEq)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
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= note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0507]: cannot move out of `other` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:13:16
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LL | #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Default)]
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| --------- in this derive macro expansion
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LL | struct StructA(String);
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| ^^^^^^ move occurs because `other.0` has type `String`, which does not implement the `Copy` trait
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= note: `#[derive(PartialEq)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
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= note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:13:16
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LL | #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Default)]
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| ---------- in this derive macro expansion
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LL | struct StructA(String);
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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= note: `#[derive(PartialOrd)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
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= note: this error originates in the derive macro `PartialOrd` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0507]: cannot move out of `other` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:13:16
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LL | #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Default)]
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| ---------- in this derive macro expansion
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LL | struct StructA(String);
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| ^^^^^^ move occurs because `other.0` has type `String`, which does not implement the `Copy` trait
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= note: `#[derive(PartialOrd)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
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= note: this error originates in the derive macro `PartialOrd` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:13:16
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LL | #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Default)]
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| --- in this derive macro expansion
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LL | struct StructA(String);
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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= note: `#[derive(Ord)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
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= note: this error originates in the derive macro `Ord` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0507]: cannot move out of `other` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:13:16
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LL | #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Default)]
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| --- in this derive macro expansion
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LL | struct StructA(String);
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| ^^^^^^ move occurs because `other.0` has type `String`, which does not implement the `Copy` trait
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= note: `#[derive(Ord)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
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= note: this error originates in the derive macro `Ord` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:13:16
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LL | #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Default)]
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| ---- in this derive macro expansion
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LL | struct StructA(String);
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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= note: `#[derive(Hash)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
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= note: this error originates in the derive macro `Hash` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:13:16
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LL | #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Default)]
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| ----- in this derive macro expansion
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LL | struct StructA(String);
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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= note: `#[derive(Clone)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
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= note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:28:9
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LL | self.0
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:38:20
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LL | let x = &{ self.0 };
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:45:12
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LL | ({ self.0 }) == ({ other.0 })
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `other` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:45:28
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LL | ({ self.0 }) == ({ other.0 })
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| ^^^^^^^ move occurs because `other.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:53:36
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LL | PartialOrd::partial_cmp(&{ self.0 }, &{ other.0 })
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `other` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:53:49
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LL | PartialOrd::partial_cmp(&{ self.0 }, &{ other.0 })
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| ^^^^^^^ move occurs because `other.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:68:20
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LL | let x = &{ self.0 };
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:75:12
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LL | ({ self.0 }) == ({ other.0 })
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `other` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:75:28
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LL | ({ self.0 }) == ({ other.0 })
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| ^^^^^^^ move occurs because `other.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:83:36
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LL | PartialOrd::partial_cmp(&{ self.0 }, &{ other.0 })
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| ^^^^^^ move occurs because `self.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `other` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:83:49
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LL | PartialOrd::partial_cmp(&{ self.0 }, &{ other.0 })
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| ^^^^^^^ move occurs because `other.0` has type `String`, which does not implement the `Copy` trait
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error[E0507]: cannot move out of `arg` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed-move-errors.rs:92:5
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LL | arg.0
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| ^^^^^ move occurs because `arg.0` has type `String`, which does not implement the `Copy` trait
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error: aborting due to 21 previous errors
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For more information about this error, try `rustc --explain E0507`.
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