diff options
Diffstat (limited to 'src/test/ui/impl-header-lifetime-elision/dyn-trait.rs')
-rw-r--r-- | src/test/ui/impl-header-lifetime-elision/dyn-trait.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/src/test/ui/impl-header-lifetime-elision/dyn-trait.rs b/src/test/ui/impl-header-lifetime-elision/dyn-trait.rs new file mode 100644 index 000000000..359c08c98 --- /dev/null +++ b/src/test/ui/impl-header-lifetime-elision/dyn-trait.rs @@ -0,0 +1,36 @@ +// Test that `impl MyTrait<'_> for &i32` is equivalent to `impl<'a, +// 'b> MyTrait<'a> for &'b i32`. + +#![allow(warnings)] + +use std::fmt::Debug; + +// Equivalent to `Box<dyn Debug + 'static>`: +trait StaticTrait { } +impl StaticTrait for Box<dyn Debug> { } + +// Equivalent to `Box<dyn Debug + 'static>`: +trait NotStaticTrait { } +impl NotStaticTrait for Box<dyn Debug + '_> { } + +// Check that we don't err when the trait has a lifetime parameter. +trait TraitWithLifetime<'a> { } +impl NotStaticTrait for &dyn TraitWithLifetime<'_> { } + +fn static_val<T: StaticTrait>(_: T) { +} + +fn with_dyn_debug_static<'a>(x: Box<dyn Debug + 'a>) { + static_val(x); + //~^ ERROR borrowed data escapes outside of function +} + +fn not_static_val<T: NotStaticTrait>(_: T) { +} + +fn with_dyn_debug_not_static<'a>(x: Box<dyn Debug + 'a>) { + not_static_val(x); // OK +} + +fn main() { +} |