mirror of https://github.com/rust-lang/rust
49 lines
2.0 KiB
Rust
49 lines
2.0 KiB
Rust
// Test that the unboxed closure sugar can be used with an arbitrary
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// struct type and that it is equivalent to the same syntax using
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// angle brackets. This test covers only simple types and in
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// particular doesn't test bound regions.
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#![feature(unboxed_closures)]
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#![allow(dead_code)]
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trait Foo<T> {
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type Output;
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fn dummy(&self, t: T, u: Self::Output);
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}
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trait Eq<X: ?Sized> { }
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impl<X: ?Sized> Eq<X> for X { }
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fn eq<A: ?Sized,B: ?Sized +Eq<A>>() { }
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fn test<'a,'b>() {
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// No errors expected:
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eq::< dyn Foo<(),Output=()>, dyn Foo() >();
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eq::< dyn Foo<(isize,),Output=()>, dyn Foo(isize) >();
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eq::< dyn Foo<(isize,usize),Output=()>, dyn Foo(isize,usize) >();
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eq::< dyn Foo<(isize,usize),Output=usize>, dyn Foo(isize,usize) -> usize >();
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eq::< dyn Foo<(&'a isize,&'b usize),Output=usize>, dyn Foo(&'a isize,&'b usize) -> usize >();
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// Test that anonymous regions in `()` form are equivalent
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// to fresh bound regions, and that we can intermingle
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// named and anonymous as we choose:
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eq::< dyn for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
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dyn for<'x,'y> Foo(&'x isize,&'y usize) -> usize >();
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eq::< dyn for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
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dyn for<'x> Foo(&'x isize,&usize) -> usize >();
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eq::< dyn for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
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dyn for<'y> Foo(&isize,&'y usize) -> usize >();
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eq::< dyn for<'x,'y> Foo<(&'x isize,&'y usize),Output=usize>,
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dyn Foo(&isize,&usize) -> usize >();
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// lifetime elision
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eq::< dyn for<'x> Foo<(&'x isize,), Output=&'x isize>,
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dyn Foo(&isize) -> &isize >();
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// Errors expected:
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eq::< dyn Foo<(),Output=()>,
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dyn Foo(char) >();
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//~^ ERROR E0277
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}
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fn main() { }
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