error[E0635]: unknown feature `const_fn_trait_ref_impls`
  --> $DIR/fn_trait_refs.rs:3:12
   |
LL | #![feature(const_fn_trait_ref_impls)]
   |            ^^^^^^^^^^^^^^^^^^^^^^^^

error[E0635]: unknown feature `const_cmp`
  --> $DIR/fn_trait_refs.rs:7:12
   |
LL | #![feature(const_cmp)]
   |            ^^^^^^^^^

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:14:8
   |
LL |     T: ~const Fn<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `Fn`
   |
note: `Fn` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:14:8
   |
LL |     T: ~const Fn<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `Fn`
   |
note: `Fn` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:14:8
   |
LL |     T: ~const Fn<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `Fn`
   |
note: `Fn` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:21:8
   |
LL |     T: ~const FnMut<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `FnMut`
   |
note: `FnMut` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:21:8
   |
LL |     T: ~const FnMut<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `FnMut`
   |
note: `FnMut` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:21:8
   |
LL |     T: ~const FnMut<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `FnMut`
   |
note: `FnMut` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:28:8
   |
LL |     T: ~const FnOnce<()>,
   |        ^^^^^^ can't be applied to `FnOnce`
   |
note: `FnOnce` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:28:8
   |
LL |     T: ~const FnOnce<()>,
   |        ^^^^^^ can't be applied to `FnOnce`
   |
note: `FnOnce` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:28:8
   |
LL |     T: ~const FnOnce<()>,
   |        ^^^^^^ can't be applied to `FnOnce`
   |
note: `FnOnce` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:35:8
   |
LL |     T: ~const Fn<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `Fn`
   |
note: `Fn` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:35:8
   |
LL |     T: ~const Fn<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `Fn`
   |
note: `Fn` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:35:8
   |
LL |     T: ~const Fn<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `Fn`
   |
note: `Fn` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:49:8
   |
LL |     T: ~const FnMut<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `FnMut`
   |
note: `FnMut` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:49:8
   |
LL |     T: ~const FnMut<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `FnMut`
   |
note: `FnMut` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: `~const` can only be applied to `#[const_trait]` traits
  --> $DIR/fn_trait_refs.rs:49:8
   |
LL |     T: ~const FnMut<()> + ~const Destruct,
   |        ^^^^^^ can't be applied to `FnMut`
   |
note: `FnMut` can't be used with `~const` because it isn't annotated with `#[const_trait]`
  --> $SRC_DIR/core/src/ops/function.rs:LL:COL
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error[E0015]: cannot call non-const operator in constants
  --> $DIR/fn_trait_refs.rs:71:17
   |
LL |         assert!(test_one == (1, 1, 1));
   |                 ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: calls in constants are limited to constant functions, tuple structs and tuple variants

error[E0015]: cannot call non-const operator in constants
  --> $DIR/fn_trait_refs.rs:74:17
   |
LL |         assert!(test_two == (2, 2));
   |                 ^^^^^^^^^^^^^^^^^^
   |
   = note: calls in constants are limited to constant functions, tuple structs and tuple variants

error[E0015]: cannot call non-const closure in constant functions
  --> $DIR/fn_trait_refs.rs:16:5
   |
LL |     f()
   |     ^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants

error[E0015]: cannot call non-const closure in constant functions
  --> $DIR/fn_trait_refs.rs:23:5
   |
LL |     f()
   |     ^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants

error[E0015]: cannot call non-const closure in constant functions
  --> $DIR/fn_trait_refs.rs:30:5
   |
LL |     f()
   |     ^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants

error: aborting due to 22 previous errors

Some errors have detailed explanations: E0015, E0635.
For more information about an error, try `rustc --explain E0015`.