mirror of
https://github.com/rust-lang/rust
synced 2024-10-14 04:23:37 +00:00
d578ac9e47
We attempt to suggest an appropriate clone for move errors on expressions
like `S { ..s }` where a field isn't `Copy`. If we can't suggest, we still don't
emit the incorrect suggestion of `S { ..s }.clone()`.
```
error[E0509]: cannot move out of type `S<K>`, which implements the `Drop` trait
--> $DIR/borrowck-struct-update-with-dtor.rs:28:19
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LL | let _s2 = S { a: 2, ..s0 };
| ^^^^^^^^^^^^^^^^
| |
| cannot move out of here
| move occurs because `s0.c` has type `K`, which does not implement the `Copy` trait
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help: clone the value from the field instead of using the spread operator syntax
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LL | let _s2 = S { a: 2, c: s0.c.clone(), ..s0 };
| +++++++++++++++++
```
```
error[E0509]: cannot move out of type `S<()>`, which implements the `Drop` trait
--> $DIR/borrowck-struct-update-with-dtor.rs:20:19
|
LL | let _s2 = S { a: 2, ..s0 };
| ^^^^^^^^^^^^^^^^
| |
| cannot move out of here
| move occurs because `s0.b` has type `B`, which does not implement the `Copy` trait
|
note: `B` doesn't implement `Copy` or `Clone`
--> $DIR/borrowck-struct-update-with-dtor.rs:4:1
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LL | struct B;
| ^^^^^^^^
help: if `B` implemented `Clone`, you could clone the value from the field instead of using the spread operator syntax
|
LL | let _s2 = S { a: 2, b: s0.b.clone(), ..s0 };
| +++++++++++++++++
```
65 lines
1.3 KiB
Rust
65 lines
1.3 KiB
Rust
// Issue 4691: Ensure that functional-struct-update can only copy, not
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// move, when the struct implements Drop.
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struct B;
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struct S<K> { a: isize, b: B, c: K }
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impl<K> Drop for S<K> { fn drop(&mut self) { } }
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struct T { a: isize, b: Box<isize> }
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impl Drop for T { fn drop(&mut self) { } }
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struct V<K> { a: isize, b: Box<isize>, c: K }
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impl<K> Drop for V<K> { fn drop(&mut self) { } }
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#[derive(Clone)]
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struct Clonable;
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mod not_all_clone {
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use super::*;
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fn a(s0: S<()>) {
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let _s2 = S { a: 2, ..s0 };
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//~^ ERROR [E0509]
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}
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fn b(s0: S<B>) {
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let _s2 = S { a: 2, ..s0 };
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//~^ ERROR [E0509]
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//~| ERROR [E0509]
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}
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fn c<K: Clone>(s0: S<K>) {
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let _s2 = S { a: 2, ..s0 };
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//~^ ERROR [E0509]
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//~| ERROR [E0509]
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}
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}
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mod all_clone {
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use super::*;
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fn a(s0: T) {
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let _s2 = T { a: 2, ..s0 };
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//~^ ERROR [E0509]
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}
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fn b(s0: T) {
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let _s2 = T { ..s0 };
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//~^ ERROR [E0509]
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}
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fn c(s0: T) {
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let _s2 = T { a: 2, b: s0.b };
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//~^ ERROR [E0509]
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}
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fn d<K: Clone>(s0: V<K>) {
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let _s2 = V { a: 2, ..s0 };
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//~^ ERROR [E0509]
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//~| ERROR [E0509]
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}
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fn e(s0: V<Clonable>) {
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let _s2 = V { a: 2, ..s0 };
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//~^ ERROR [E0509]
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//~| ERROR [E0509]
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}
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}
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fn main() { }
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