35 lines
626 B
Rust
35 lines
626 B
Rust
// Tests that unsafe extern fn pointers do not implement any Fn traits.
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use std::ops::{Fn, FnMut, FnOnce};
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unsafe fn square(x: &isize) -> isize {
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(*x) * (*x)
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}
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fn call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize {
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0
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}
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fn call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize {
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0
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}
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fn call_it_once<F: FnOnce(&isize) -> isize>(_: F, _: isize) -> isize {
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0
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}
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fn a() {
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let x = call_it(&square, 22);
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//~^ ERROR E0277
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}
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fn b() {
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let y = call_it_mut(&mut square, 22);
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//~^ ERROR E0277
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}
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fn c() {
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let z = call_it_once(square, 22);
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//~^ ERROR E0277
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}
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fn main() {}
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