error: functions cannot be both `const` and `async`
  --> $DIR/fn-header-semantic-fail.rs:10:5
   |
LL |     const async unsafe extern "C" fn ff5() {}
   |     ^^^^^-^^^^^------------------------------
   |     |     |
   |     |     `async` because of this
   |     `const` because of this

error[E0379]: functions in traits cannot be declared const
  --> $DIR/fn-header-semantic-fail.rs:16:9
   |
LL |         const fn ft3();
   |         ^^^^^-
   |         |
   |         functions in traits cannot be const
   |         help: remove the `const`

error[E0379]: functions in traits cannot be declared const
  --> $DIR/fn-header-semantic-fail.rs:18:9
   |
LL |         const async unsafe extern "C" fn ft5();
   |         ^^^^^-
   |         |
   |         functions in traits cannot be const
   |         help: remove the `const`

error: functions cannot be both `const` and `async`
  --> $DIR/fn-header-semantic-fail.rs:18:9
   |
LL |         const async unsafe extern "C" fn ft5();
   |         ^^^^^-^^^^^----------------------------
   |         |     |
   |         |     `async` because of this
   |         `const` because of this

error[E0379]: functions in trait impls cannot be declared const
  --> $DIR/fn-header-semantic-fail.rs:27:9
   |
LL |         const fn ft3() {}
   |         ^^^^^-
   |         |
   |         functions in trait impls cannot be const
   |         help: remove the `const`

error[E0379]: functions in trait impls cannot be declared const
  --> $DIR/fn-header-semantic-fail.rs:29:9
   |
LL |         const async unsafe extern "C" fn ft5() {}
   |         ^^^^^-
   |         |
   |         functions in trait impls cannot be const
   |         help: remove the `const`

error: functions cannot be both `const` and `async`
  --> $DIR/fn-header-semantic-fail.rs:29:9
   |
LL |         const async unsafe extern "C" fn ft5() {}
   |         ^^^^^-^^^^^------------------------------
   |         |     |
   |         |     `async` because of this
   |         `const` because of this

error: functions cannot be both `const` and `async`
  --> $DIR/fn-header-semantic-fail.rs:39:9
   |
LL |         const async unsafe extern "C" fn fi5() {}
   |         ^^^^^-^^^^^------------------------------
   |         |     |
   |         |     `async` because of this
   |         `const` because of this

error: functions in `extern` blocks cannot have `async` qualifier
  --> $DIR/fn-header-semantic-fail.rs:44:9
   |
LL |     extern "C" {
   |     ---------- in this `extern` block
LL |         async fn fe1();
   |         ^^^^^ help: remove the `async` qualifier

error: items in `extern` blocks without an `unsafe` qualifier cannot have safety qualifiers
  --> $DIR/fn-header-semantic-fail.rs:45:9
   |
LL |         unsafe fn fe2();
   |         ^^^^^^^^^^^^^^^^
   |
help: add `unsafe` to this `extern` block
   |
LL |     unsafe extern "C" {
   |     ++++++

error: functions in `extern` blocks cannot have `const` qualifier
  --> $DIR/fn-header-semantic-fail.rs:46:9
   |
LL |     extern "C" {
   |     ---------- in this `extern` block
...
LL |         const fn fe3();
   |         ^^^^^ help: remove the `const` qualifier

error: functions in `extern` blocks cannot have `extern` qualifier
  --> $DIR/fn-header-semantic-fail.rs:47:9
   |
LL |     extern "C" {
   |     ---------- in this `extern` block
...
LL |         extern "C" fn fe4();
   |         ^^^^^^^^^^ help: remove the `extern` qualifier

error: functions in `extern` blocks cannot have `async` qualifier
  --> $DIR/fn-header-semantic-fail.rs:48:15
   |
LL |     extern "C" {
   |     ---------- in this `extern` block
...
LL |         const async unsafe extern "C" fn fe5();
   |               ^^^^^ help: remove the `async` qualifier

error: functions in `extern` blocks cannot have `const` qualifier
  --> $DIR/fn-header-semantic-fail.rs:48:9
   |
LL |     extern "C" {
   |     ---------- in this `extern` block
...
LL |         const async unsafe extern "C" fn fe5();
   |         ^^^^^ help: remove the `const` qualifier

error: functions in `extern` blocks cannot have `extern` qualifier
  --> $DIR/fn-header-semantic-fail.rs:48:28
   |
LL |     extern "C" {
   |     ---------- in this `extern` block
...
LL |         const async unsafe extern "C" fn fe5();
   |                            ^^^^^^^^^^ help: remove the `extern` qualifier

error: items in `extern` blocks without an `unsafe` qualifier cannot have safety qualifiers
  --> $DIR/fn-header-semantic-fail.rs:48:9
   |
LL |         const async unsafe extern "C" fn fe5();
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: add `unsafe` to this `extern` block
   |
LL |     unsafe extern "C" {
   |     ++++++

error: functions cannot be both `const` and `async`
  --> $DIR/fn-header-semantic-fail.rs:48:9
   |
LL |         const async unsafe extern "C" fn fe5();
   |         ^^^^^-^^^^^----------------------------
   |         |     |
   |         |     `async` because of this
   |         `const` because of this

error: aborting due to 17 previous errors

For more information about this error, try `rustc --explain E0379`.