error[E0277]: expected a `Fn()` closure, found `#[target_features] fn() {foo}`
  --> $DIR/fn-traits.rs:29:10
   |
LL |     call(foo);
   |     ---- ^^^ expected an `Fn()` closure, found `#[target_features] fn() {foo}`
   |     |
   |     required by a bound introduced by this call
   |
   = help: the trait `Fn()` is not implemented for fn item `#[target_features] fn() {foo}`
   = note: wrap the `#[target_features] fn() {foo}` in a closure with no arguments: `|| { /* code */ }`
   = note: `#[target_feature]` functions do not implement the `Fn` traits
   = note: try casting the function to a `fn` pointer or wrapping it in a closure
note: required by a bound in `call`
  --> $DIR/fn-traits.rs:12:17
   |
LL | fn call(f: impl Fn()) {
   |                 ^^^^ required by this bound in `call`

error[E0277]: expected a `FnMut()` closure, found `#[target_features] fn() {foo}`
  --> $DIR/fn-traits.rs:30:14
   |
LL |     call_mut(foo);
   |     -------- ^^^ expected an `FnMut()` closure, found `#[target_features] fn() {foo}`
   |     |
   |     required by a bound introduced by this call
   |
   = help: the trait `FnMut()` is not implemented for fn item `#[target_features] fn() {foo}`
   = note: wrap the `#[target_features] fn() {foo}` in a closure with no arguments: `|| { /* code */ }`
   = note: `#[target_feature]` functions do not implement the `Fn` traits
   = note: try casting the function to a `fn` pointer or wrapping it in a closure
note: required by a bound in `call_mut`
  --> $DIR/fn-traits.rs:16:25
   |
LL | fn call_mut(mut f: impl FnMut()) {
   |                         ^^^^^^^ required by this bound in `call_mut`

error[E0277]: expected a `FnOnce()` closure, found `#[target_features] fn() {foo}`
  --> $DIR/fn-traits.rs:31:15
   |
LL |     call_once(foo);
   |     --------- ^^^ expected an `FnOnce()` closure, found `#[target_features] fn() {foo}`
   |     |
   |     required by a bound introduced by this call
   |
   = help: the trait `FnOnce()` is not implemented for fn item `#[target_features] fn() {foo}`
   = note: wrap the `#[target_features] fn() {foo}` in a closure with no arguments: `|| { /* code */ }`
   = note: `#[target_feature]` functions do not implement the `Fn` traits
   = note: try casting the function to a `fn` pointer or wrapping it in a closure
note: required by a bound in `call_once`
  --> $DIR/fn-traits.rs:20:22
   |
LL | fn call_once(f: impl FnOnce()) {
   |                      ^^^^^^^^ required by this bound in `call_once`

error[E0277]: expected a `FnOnce(i32)` closure, found `#[target_features] fn(i32) {bar}`
  --> $DIR/fn-traits.rs:32:19
   |
LL |     call_once_i32(bar);
   |     ------------- ^^^ expected an `FnOnce(i32)` closure, found `#[target_features] fn(i32) {bar}`
   |     |
   |     required by a bound introduced by this call
   |
   = help: the trait `FnOnce(i32)` is not implemented for fn item `#[target_features] fn(i32) {bar}`
   = note: `#[target_feature]` functions do not implement the `Fn` traits
   = note: try casting the function to a `fn` pointer or wrapping it in a closure
note: required by a bound in `call_once_i32`
  --> $DIR/fn-traits.rs:24:26
   |
LL | fn call_once_i32(f: impl FnOnce(i32)) {
   |                          ^^^^^^^^^^^ required by this bound in `call_once_i32`

error[E0277]: expected a `Fn()` closure, found `unsafe fn() {foo_unsafe}`
  --> $DIR/fn-traits.rs:34:10
   |
LL |     call(foo_unsafe);
   |     ---- ^^^^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
   |     |
   |     required by a bound introduced by this call
   |
   = help: the trait `Fn()` is not implemented for fn item `unsafe fn() {foo_unsafe}`
   = note: unsafe function cannot be called generically without an unsafe block
   = note: wrap the `unsafe fn() {foo_unsafe}` in a closure with no arguments: `|| { /* code */ }`
   = note: `#[target_feature]` functions do not implement the `Fn` traits
   = note: try casting the function to a `fn` pointer or wrapping it in a closure
note: required by a bound in `call`
  --> $DIR/fn-traits.rs:12:17
   |
LL | fn call(f: impl Fn()) {
   |                 ^^^^ required by this bound in `call`

error[E0277]: expected a `FnMut()` closure, found `unsafe fn() {foo_unsafe}`
  --> $DIR/fn-traits.rs:36:14
   |
LL |     call_mut(foo_unsafe);
   |     -------- ^^^^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
   |     |
   |     required by a bound introduced by this call
   |
   = help: the trait `FnMut()` is not implemented for fn item `unsafe fn() {foo_unsafe}`
   = note: unsafe function cannot be called generically without an unsafe block
   = note: wrap the `unsafe fn() {foo_unsafe}` in a closure with no arguments: `|| { /* code */ }`
   = note: `#[target_feature]` functions do not implement the `Fn` traits
   = note: try casting the function to a `fn` pointer or wrapping it in a closure
note: required by a bound in `call_mut`
  --> $DIR/fn-traits.rs:16:25
   |
LL | fn call_mut(mut f: impl FnMut()) {
   |                         ^^^^^^^ required by this bound in `call_mut`

error[E0277]: expected a `FnOnce()` closure, found `unsafe fn() {foo_unsafe}`
  --> $DIR/fn-traits.rs:38:15
   |
LL |     call_once(foo_unsafe);
   |     --------- ^^^^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
   |     |
   |     required by a bound introduced by this call
   |
   = help: the trait `FnOnce()` is not implemented for fn item `unsafe fn() {foo_unsafe}`
   = note: unsafe function cannot be called generically without an unsafe block
   = note: wrap the `unsafe fn() {foo_unsafe}` in a closure with no arguments: `|| { /* code */ }`
   = note: `#[target_feature]` functions do not implement the `Fn` traits
   = note: try casting the function to a `fn` pointer or wrapping it in a closure
note: required by a bound in `call_once`
  --> $DIR/fn-traits.rs:20:22
   |
LL | fn call_once(f: impl FnOnce()) {
   |                      ^^^^^^^^ required by this bound in `call_once`

error: aborting due to 7 previous errors

For more information about this error, try `rustc --explain E0277`.