diff options
Diffstat (limited to 'src/test/ui/dropck/dropck-eyepatch-implies-unsafe-impl.rs')
-rw-r--r-- | src/test/ui/dropck/dropck-eyepatch-implies-unsafe-impl.rs | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/dropck/dropck-eyepatch-implies-unsafe-impl.rs b/src/test/ui/dropck/dropck-eyepatch-implies-unsafe-impl.rs new file mode 100644 index 000000000..6869ab1c4 --- /dev/null +++ b/src/test/ui/dropck/dropck-eyepatch-implies-unsafe-impl.rs @@ -0,0 +1,35 @@ +#![feature(dropck_eyepatch)] + +// This test ensures that a use of `#[may_dangle]` is rejected if +// it is not attached to an `unsafe impl`. + +use std::fmt; + +struct Dt<A: fmt::Debug>(&'static str, A); +struct Dr<'a, B:'a+fmt::Debug>(&'static str, &'a B); +struct Pt<A,B: fmt::Debug>(&'static str, A, B); +struct Pr<'a, 'b, B:'a+'b+fmt::Debug>(&'static str, &'a B, &'b B); +struct St<A: fmt::Debug>(&'static str, A); +struct Sr<'a, B:'a+fmt::Debug>(&'static str, &'a B); + +impl<A: fmt::Debug> Drop for Dt<A> { + fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); } +} +impl<'a, B: fmt::Debug> Drop for Dr<'a, B> { + fn drop(&mut self) { println!("drop {} {:?}", self.0, self.1); } +} +impl<#[may_dangle] A, B: fmt::Debug> Drop for Pt<A, B> { + //~^ ERROR requires an `unsafe impl` declaration due to `#[may_dangle]` attribute + + // (unsafe to access self.1 due to #[may_dangle] on A) + fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); } +} +impl<#[may_dangle] 'a, 'b, B: fmt::Debug> Drop for Pr<'a, 'b, B> { + //~^ ERROR requires an `unsafe impl` declaration due to `#[may_dangle]` attribute + + // (unsafe to access self.1 due to #[may_dangle] on 'a) + fn drop(&mut self) { println!("drop {} {:?}", self.0, self.2); } +} + +fn main() { +} |