E0499 error shouldn't suggest adding a semicolon when there already is one #133941
Open
Description
Code
use std::marker::PhantomData;
struct Bar<'a>(PhantomData<&'a mut i32>);
impl<'a> Drop for Bar<'a> {
fn drop(&mut self) {}
}
struct Foo();
impl Foo {
fn f(&mut self) -> Option<Bar<'_>> {
None
}
fn g(&mut self) {}
}
fn main() {
let mut foo = Foo();
while let Some(_) = foo.f() {
foo.g();
};
}Current output
Compiling playground v0.0.1 (/playground)
error[E0499]: cannot borrow `foo` as mutable more than once at a time
--> src/main.rs:22:9
|
21 | while let Some(_) = foo.f() {
| -------
| |
| first mutable borrow occurs here
| a temporary with access to the first borrow is created here ...
22 | foo.g();
| ^^^ second mutable borrow occurs here
23 | };
| - ... and the first borrow might be used here, when that temporary is dropped and runs the destructor for type `Option<Bar<'_>>`
|
help: consider adding semicolon after the expression so its temporaries are dropped sooner, before the local variables declared by the block are dropped
|
23 | };;
| +
For more information about this error, try `rustc --explain E0499`.
error: could not compile `playground` (bin "playground") due to 1 previous errorDesired output
Not have the help section since there already is a semicolonRationale and extra context
No response
Other cases
Rust Version
Tested on the Rust Playground with both stable 1.83.0 and 1.85.0-nightly 2024-12-04 acabb52 (sorry for the lack of the exact command you wanted, but see rust-lang/rust-playground#1043)
Anything else?
No response
Activity