warning: the feature `precise_capturing` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/self-capture.rs:3:12
   |
LL | #![feature(precise_capturing)]
   |            ^^^^^^^^^^^^^^^^^
   |
   = note: see issue #123432 <https://github.com/rust-lang/rust/issues/123432> for more information
   = note: `#[warn(incomplete_features)]` on by default

warning: 1 warning emitted