tests/ui/borrowck/option-inspect-mutation.rs

//! Regression test for <https://github.com/rust-lang/rust/issues/128381>.

struct Struct {
    field: u32,
}

fn main() {
    let mut some_struct = Some(Struct { field: 42 });
    some_struct.as_mut().inspect(|some_struct| {
        some_struct.field *= 10; //~ ERROR cannot assign to `some_struct.field`, which is behind a `&` reference
        // Users can't change type of `some_struct` param, so above error must not suggest it.
    });

    // Same check as above but using `hir::ExprKind::Call` instead of `hir::ExprKind::MethodCall`.
    Option::inspect(some_struct.as_mut(), |some_struct| {
        some_struct.field *= 20; //~ ERROR cannot assign to `some_struct.field`, which is behind a `&` reference
    });
}