warning: the feature `fn_delegation` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/parse.rs:4:12
   |
LL | #![feature(fn_delegation)]
   |            ^^^^^^^^^^^^^
   |
   = note: see issue #118212 <https://github.com/rust-lang/rust/issues/118212> for more information
   = note: `#[warn(incomplete_features)]` on by default

warning: 1 warning emitted