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Rollup merge of rust-lang#124313 - estebank:split-at-mut, r=fee1-dead Detect borrow error involving sub-slices and suggest `split_at_mut` ``` error[E0499]: cannot borrow `foo` as mutable more than once at a time --> $DIR/suggest-split-at-mut.rs:13:18 | LL | let a = &mut foo[..2]; | --- first mutable borrow occurs here LL | let b = &mut foo[2..]; | ^^^ second mutable borrow occurs here LL | a[0] = 5; | ---- first borrow later used here | = help: use `.split_at_mut(position)` or similar method to obtain two mutable non-overlapping sub-slices ``` Address most of rust-lang#58792. For follow up work, we should emit a structured suggestion for cases where we can identify the exact `let (a, b) = foo.split_at_mut(2);` call that is needed.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,62 @@ | ||
| fn main() { | ||
| fn foo() { | ||
| let mut foo = [1, 2, 3, 4]; | ||
| let a = &mut foo[2]; | ||
| let b = &mut foo[3]; //~ ERROR cannot borrow `foo[_]` as mutable more than once at a time | ||
| *a = 5; | ||
| *b = 6; | ||
| println!("{:?} {:?}", a, b); | ||
| } | ||
|
|
||
| fn bar() { | ||
| let mut foo = [1,2,3,4]; | ||
| let a = &mut foo[..2]; | ||
| let b = &mut foo[2..]; //~ ERROR cannot borrow `foo` as mutable more than once at a time | ||
| a[0] = 5; | ||
| b[0] = 6; | ||
| println!("{:?} {:?}", a, b); | ||
| } | ||
|
|
||
| fn baz() { | ||
| let mut foo = [1,2,3,4]; | ||
| let a = &foo[..2]; | ||
| let b = &mut foo[2..]; //~ ERROR cannot borrow `foo` as mutable because it is also borrowed as immutable | ||
| b[0] = 6; | ||
| println!("{:?} {:?}", a, b); | ||
| } | ||
|
|
||
| fn qux() { | ||
| let mut foo = [1,2,3,4]; | ||
| let a = &mut foo[..2]; | ||
| let b = &foo[2..]; //~ ERROR cannot borrow `foo` as immutable because it is also borrowed as mutable | ||
| a[0] = 5; | ||
| println!("{:?} {:?}", a, b); | ||
| } | ||
|
|
||
| fn bad() { | ||
| let mut foo = [1,2,3,4]; | ||
| let a = &foo[1]; | ||
| let b = &mut foo[2]; //~ ERROR cannot borrow `foo[_]` as mutable because it is also borrowed as immutable | ||
| *b = 6; | ||
| println!("{:?} {:?}", a, b); | ||
| } | ||
|
|
||
| fn bat() { | ||
| let mut foo = [1,2,3,4]; | ||
| let a = &mut foo[1]; | ||
| let b = &foo[2]; //~ ERROR cannot borrow `foo[_]` as immutable because it is also borrowed as mutable | ||
| *a = 5; | ||
| println!("{:?} {:?}", a, b); | ||
| } | ||
|
|
||
| fn ang() { | ||
| let mut foo = [1,2,3,4]; | ||
| let a = &mut foo[0..]; | ||
| let b = &foo[0..]; //~ ERROR cannot borrow `foo` as immutable because it is also borrowed as mutable | ||
| a[0] = 5; | ||
| println!("{:?} {:?}", a, b); | ||
| } | ||
|
|
||
| fn main() { | ||
| foo(); | ||
| bar(); | ||
| } |
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