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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/unboxed-closures/unboxed-closures-wrong-arg-type-extern-fn.rs | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/unboxed-closures/unboxed-closures-wrong-arg-type-extern-fn.rs b/src/test/ui/unboxed-closures/unboxed-closures-wrong-arg-type-extern-fn.rs new file mode 100644 index 000000000..02e8b7b47 --- /dev/null +++ b/src/test/ui/unboxed-closures/unboxed-closures-wrong-arg-type-extern-fn.rs @@ -0,0 +1,35 @@ +// Tests that unsafe extern fn pointers do not implement any Fn traits. + +use std::ops::{Fn, FnMut, FnOnce}; + +unsafe fn square(x: isize) -> isize { + x * x +} +// note: argument type here is `isize`, not `&isize` + +fn call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize { + 0 +} +fn call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize { + 0 +} +fn call_it_once<F: FnOnce(&isize) -> isize>(_: F, _: isize) -> isize { + 0 +} + +fn a() { + let x = call_it(&square, 22); + //~^ ERROR E0277 +} + +fn b() { + let y = call_it_mut(&mut square, 22); + //~^ ERROR E0277 +} + +fn c() { + let z = call_it_once(square, 22); + //~^ ERROR E0277 +} + +fn main() {} |