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// Ensures that all `fn` forms can have all the function qualifiers syntactically.
//@ edition:2018
fn main() {
async fn ff1() {} // OK.
unsafe fn ff2() {} // OK.
const fn ff3() {} // OK.
extern "C" fn ff4() {} // OK.
const async unsafe extern "C" fn ff5() {}
//~^ ERROR functions cannot be both `const` and `async`
trait X {
async fn ft1(); // OK.
unsafe fn ft2(); // OK.
const fn ft3(); //~ ERROR functions in traits cannot be declared const
extern "C" fn ft4(); // OK.
const async unsafe extern "C" fn ft5();
//~^ ERROR functions in traits cannot be declared const
//~| ERROR functions cannot be both `const` and `async`
}
struct Y;
impl X for Y {
async fn ft1() {} // OK.
unsafe fn ft2() {} // OK.
const fn ft3() {} //~ ERROR functions in trait impls cannot be declared const
extern "C" fn ft4() {}
const async unsafe extern "C" fn ft5() {}
//~^ ERROR functions in trait impls cannot be declared const
//~| ERROR functions cannot be both `const` and `async`
}
impl Y {
async fn fi1() {} // OK.
unsafe fn fi2() {} // OK.
const fn fi3() {} // OK.
extern "C" fn fi4() {} // OK.
const async unsafe extern "C" fn fi5() {}
//~^ ERROR functions cannot be both `const` and `async`
}
extern "C" {
async fn fe1(); //~ ERROR functions in `extern` blocks cannot
unsafe fn fe2(); //~ ERROR items in `extern` blocks without an `unsafe` qualifier cannot
const fn fe3(); //~ ERROR functions in `extern` blocks cannot
extern "C" fn fe4(); //~ ERROR functions in `extern` blocks cannot
const async unsafe extern "C" fn fe5();
//~^ ERROR functions in `extern` blocks
//~| ERROR functions in `extern` blocks
//~| ERROR functions in `extern` blocks
//~| ERROR functions cannot be both `const` and `async`
//~| ERROR items in `extern` blocks without an `unsafe` qualifier cannot have
}
}
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