| // run-pass |
| #![feature(box_syntax)] |
| #![feature(unboxed_closures, fn_traits)] |
| |
| // Test that unboxing shim for calling rust-call ABI methods through a |
| // trait box works and does not cause an ICE. |
| |
| struct Foo { foo: u32 } |
| |
| impl FnMut<()> for Foo { |
| extern "rust-call" fn call_mut(&mut self, _: ()) -> u32 { self.foo } |
| } |
| |
| impl FnOnce<()> for Foo { |
| type Output = u32; |
| extern "rust-call" fn call_once(mut self, _: ()) -> u32 { self.call_mut(()) } |
| } |
| |
| ///////////////////////////////////////////////////////////////////////// |
| |
| impl FnMut<(u32,)> for Foo { |
| extern "rust-call" fn call_mut(&mut self, (x,): (u32,)) -> u32 { self.foo + x } |
| } |
| |
| impl FnOnce<(u32,)> for Foo { |
| type Output = u32; |
| extern "rust-call" fn call_once(mut self, args: (u32,)) -> u32 { self.call_mut(args) } |
| } |
| |
| ///////////////////////////////////////////////////////////////////////// |
| |
| impl FnMut<(u32,u32)> for Foo { |
| extern "rust-call" fn call_mut(&mut self, (x, y): (u32, u32)) -> u32 { self.foo + x + y } |
| } |
| |
| impl FnOnce<(u32,u32)> for Foo { |
| type Output = u32; |
| extern "rust-call" fn call_once(mut self, args: (u32,u32)) -> u32 { self.call_mut(args) } |
| } |
| |
| fn main() { |
| let mut f = box Foo { foo: 42 } as Box<dyn FnMut() -> u32>; |
| assert_eq!(f.call_mut(()), 42); |
| |
| let mut f = box Foo { foo: 40 } as Box<dyn FnMut(u32) -> u32>; |
| assert_eq!(f.call_mut((2,)), 42); |
| |
| let mut f = box Foo { foo: 40 } as Box<dyn FnMut(u32, u32) -> u32>; |
| assert_eq!(f.call_mut((1, 1)), 42); |
| } |
