Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/src/test/ui/drop/auxiliary/dropck_eyepatch_extern_crate.rs b/src/test/ui/drop/auxiliary/dropck_eyepatch_extern_crate.rs
new file mode 100644
index 000000000..270d5de7a
--- /dev/null
+++ b/src/test/ui/drop/auxiliary/dropck_eyepatch_extern_crate.rs
@@ -0,0 +1,50 @@
+#![feature(dropck_eyepatch)]
+
+// The point of this test is to illustrate that the `#[may_dangle]`
+// attribute specifically allows, in the context of a type
+// implementing `Drop`, a generic parameter to be instantiated with a
+// lifetime that does not strictly outlive the owning type itself,
+// and that this attributes effects are preserved when importing
+// the type from another crate.
+//
+// See also dropck-eyepatch.rs for more information about the general
+// structure of the test.
+
+use std::cell::RefCell;
+
+pub trait Foo { fn foo(&self, _: &str); }
+
+pub struct Dt<A: Foo>(pub &'static str, pub A);
+pub struct Dr<'a, B:'a+Foo>(pub &'static str, pub &'a B);
+pub struct Pt<A,B: Foo>(pub &'static str, pub A, pub B);
+pub struct Pr<'a, 'b, B:'a+'b+Foo>(pub &'static str, pub &'a B, pub &'b B);
+pub struct St<A: Foo>(pub &'static str, pub A);
+pub struct Sr<'a, B:'a+Foo>(pub &'static str, pub &'a B);
+
+impl<A: Foo> Drop for Dt<A> {
+    fn drop(&mut self) { println!("drop {}", self.0); self.1.foo(self.0); }
+}
+impl<'a, B: Foo> Drop for Dr<'a, B> {
+    fn drop(&mut self) { println!("drop {}", self.0); self.1.foo(self.0); }
+}
+unsafe impl<#[may_dangle] A, B: Foo> Drop for Pt<A, B> {
+    // (unsafe to access self.1  due to #[may_dangle] on A)
+    fn drop(&mut self) { println!("drop {}", self.0); self.2.foo(self.0); }
+}
+unsafe impl<#[may_dangle] 'a, 'b, B: Foo> Drop for Pr<'a, 'b, B> {
+    // (unsafe to access self.1 due to #[may_dangle] on 'a)
+    fn drop(&mut self) { println!("drop {}", self.0); self.2.foo(self.0); }
+}
+
+impl Foo for RefCell<String> {
+    fn foo(&self, s: &str) {
+        let s2 = format!("{}|{}", *self.borrow(), s);
+        *self.borrow_mut() = s2;
+    }
+}
+
+impl<'a, T:Foo> Foo for &'a T {
+    fn foo(&self, s: &str) {
+        (*self).foo(s);
+    }
+}