diff options
Diffstat (limited to 'src/test/ui/associated-types/cache/project-fn-ret-contravariant.rs')
-rw-r--r-- | src/test/ui/associated-types/cache/project-fn-ret-contravariant.rs | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/src/test/ui/associated-types/cache/project-fn-ret-contravariant.rs b/src/test/ui/associated-types/cache/project-fn-ret-contravariant.rs deleted file mode 100644 index f1ea6627a..000000000 --- a/src/test/ui/associated-types/cache/project-fn-ret-contravariant.rs +++ /dev/null @@ -1,50 +0,0 @@ -#![feature(unboxed_closures)] - -// Test for projection cache. We should be able to project distinct -// lifetimes from `foo` as we reinstantiate it multiple times, but not -// if we do it just once. In this variant, the region `'a` is used in -// an contravariant position, which affects the results. - -// revisions: ok oneuse transmute krisskross -//[ok] check-pass -//[oneuse] check-pass - -#![allow(dead_code, unused_variables)] - -fn foo<'a>() -> &'a u32 { loop { } } - -fn bar<T>(t: T, x: T::Output) -> T::Output - where T: FnOnce<()> -{ - t() -} - -#[cfg(ok)] // two instantiations: OK -fn baz<'a,'b>(x: &'a u32, y: &'b u32) -> (&'a u32, &'b u32) { - let a = bar(foo, x); - let b = bar(foo, y); - (a, b) -} - -#[cfg(oneuse)] // one instantiation: OK (surprisingly) -fn baz<'a,'b>(x: &'a u32, y: &'b u32) -> (&'a u32, &'b u32) { - let f /* : fn() -> &'static u32 */ = foo; // <-- inferred type annotated - let a = bar(f, x); // this is considered ok because fn args are contravariant... - let b = bar(f, y); // ...and hence we infer T to distinct values in each call. - (a, b) -} - -#[cfg(transmute)] // one instantiations: BAD -fn baz<'a,'b>(x: &'a u32) -> &'static u32 { - bar(foo, x) //[transmute]~ ERROR lifetime may not live long enough -} - -#[cfg(krisskross)] // two instantiations, mixing and matching: BAD -fn transmute<'a,'b>(x: &'a u32, y: &'b u32) -> (&'a u32, &'b u32) { - let a = bar(foo, y); - let b = bar(foo, x); - (a, b) //[krisskross]~ ERROR lifetime may not live long enough - //[krisskross]~^ ERROR lifetime may not live long enough -} - -fn main() { } |