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Diffstat (limited to 'src/test/ui/issues/issue-16739.rs')
-rw-r--r-- | src/test/ui/issues/issue-16739.rs | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-16739.rs b/src/test/ui/issues/issue-16739.rs new file mode 100644 index 000000000..94da2ca5c --- /dev/null +++ b/src/test/ui/issues/issue-16739.rs @@ -0,0 +1,46 @@ +// 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); +} |