error[E0658]: use of unstable library feature 'fn_traits' (see issue #29625)
  --> $DIR/feature-gate-unboxed-closures-ufcs-calls.rs:14:5
   |
LL |     Fn::call(&f, ()); //~ ERROR use of unstable library feature 'fn_traits'
   |     ^^^^^^^^
   |
   = help: add #![feature(fn_traits)] to the crate attributes to enable

error[E0658]: use of unstable library feature 'fn_traits' (see issue #29625)
  --> $DIR/feature-gate-unboxed-closures-ufcs-calls.rs:15:5
   |
LL |     FnMut::call_mut(&mut f, ()); //~ ERROR use of unstable library feature 'fn_traits'
   |     ^^^^^^^^^^^^^^^
   |
   = help: add #![feature(fn_traits)] to the crate attributes to enable

error[E0658]: use of unstable library feature 'fn_traits' (see issue #29625)
  --> $DIR/feature-gate-unboxed-closures-ufcs-calls.rs:16:5
   |
LL |     FnOnce::call_once(f, ()); //~ ERROR use of unstable library feature 'fn_traits'
   |     ^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(fn_traits)] to the crate attributes to enable

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0658`.