error[E0658]: use of unstable library feature 'fn_traits' (see issue #29625)
  --> $DIR/feature-gate-unboxed-closures-method-calls.rs:14:7
   |
LL |     f.call(()); //~ 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-method-calls.rs:15:7
   |
LL |     f.call_mut(()); //~ 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-method-calls.rs:16:7
   |
LL |     f.call_once(()); //~ 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`.