diff options
Diffstat (limited to 'src/test/ui/type-alias-impl-trait/implied_bounds_closure.rs')
-rw-r--r-- | src/test/ui/type-alias-impl-trait/implied_bounds_closure.rs | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/implied_bounds_closure.rs b/src/test/ui/type-alias-impl-trait/implied_bounds_closure.rs new file mode 100644 index 000000000..4cf35f951 --- /dev/null +++ b/src/test/ui/type-alias-impl-trait/implied_bounds_closure.rs @@ -0,0 +1,31 @@ +trait StaticDefaultRef: 'static { + fn default_ref() -> &'static Self; +} + +impl StaticDefaultRef for str { + fn default_ref() -> &'static str { + "" + } +} + +fn into_impl(x: &str) -> &(impl ?Sized + AsRef<str> + StaticDefaultRef + '_) { + x +} + +fn extend_lifetime<'a>(x: &'a str) -> &'static str { + let t = into_impl(x); + helper(|_| t) //~ ERROR lifetime may not live long enough +} + +fn helper<T: ?Sized + AsRef<str> + StaticDefaultRef>(f: impl FnOnce(&T) -> &T) -> &'static str { + f(T::default_ref()).as_ref() +} + +fn main() { + let r; + { + let x = String::from("Hello World?"); + r = extend_lifetime(&x); + } + println!("{}", r); +} |