1 error[E0381]: assigned binding `x.0` isn't fully initialized
2 --> $DIR/borrowck-partial-reinit-4.rs:17:5
4 LL | let mut x : (Test2, Test2);
5 | ----- binding declared here but left uninitialized
6 LL | (x.0).0 = Some(Test);
7 | ^^^^^^^ `x.0` assigned here but it isn't fully initialized
9 = help: partial initialization isn't supported, fully initialize the binding with a default value and mutate it, or use `std::mem::MaybeUninit`
11 error: aborting due to previous error
13 For more information about this error, try `rustc --explain E0381`.