diff options
| -rw-r--r-- | src/librustc_borrowck/diagnostics.rs | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/src/librustc_borrowck/diagnostics.rs b/src/librustc_borrowck/diagnostics.rs index 0bc43952926..e94a214309d 100644 --- a/src/librustc_borrowck/diagnostics.rs +++ b/src/librustc_borrowck/diagnostics.rs @@ -181,6 +181,36 @@ fn main(){ ``` "##, +E0386: r##" +This error occurs when an attempt is made to mutate the target of a mutable +reference stored inside an immutable container. + +For example, this can happen when storing a `&mut` inside an immutable `Box`: + +``` +let mut x: i64 = 1; +let y: Box<_> = Box::new(&mut x); +**y = 2; // error, cannot assign to data in an immutable container +``` + +This error can be fixed by making the container mutable: + +``` +let mut x: i64 = 1; +let mut y: Box<_> = Box::new(&mut x); +**y = 2; +``` + +It can also be fixed by using a type with interior mutability, such as `Cell` or +`RefCell`: + +``` +let x: i64 = 1; +let y: Box<Cell<_>> = Box::new(Cell::new(x)); +y.set(2); +``` +"##, + E0387: r##" This error occurs when an attempt is made to mutate or mutably reference data that a closure has captured immutably. Examples of this error are shown below: @@ -239,7 +269,6 @@ https://doc.rust-lang.org/std/cell/ register_diagnostics! { E0385, // {} in an aliasable location - E0386, // {} in an immutable container E0388, // {} in a static location E0389 // {} in a `&` reference } |