Merging upstream version 1.68.2+dfsg1.

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

1 files changed, 82 insertions, 0 deletions

diff --git a/tests/ui/dropck/dropck-eyepatch-extern-crate.rs b/tests/ui/dropck/dropck-eyepatch-extern-crate.rs
new file mode 100644
index 000000000..b8f303554
--- /dev/null
+++ b/tests/ui/dropck/dropck-eyepatch-extern-crate.rs
@@ -0,0 +1,82 @@
+// aux-build:dropck_eyepatch_extern_crate.rs
+
+// 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 attribute's 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.
+extern crate dropck_eyepatch_extern_crate as other;
+
+use other::{Dt,Dr,Pt,Pr,St,Sr};
+
+fn main() {
+    use std::cell::Cell;
+
+    // We use separate blocks with separate variable to prevent the error
+    // messages from being deduplicated.
+
+    {
+        let c_long;
+        let (mut dt, mut dr): (Dt<_>, Dr<_>);
+        c_long = Cell::new(1);
+
+        // No error: sufficiently long-lived state can be referenced in dtors
+        dt = Dt("dt", &c_long);
+        dr = Dr("dr", &c_long);
+    }
+
+    {
+        let (c, mut dt, mut dr): (Cell<_>, Dt<_>, Dr<_>);
+        c = Cell::new(1);
+
+        // No Error: destructor order precisely modelled
+        dt = Dt("dt", &c);
+        dr = Dr("dr", &c);
+    }
+
+    {
+        let (mut dt, mut dr, c_shortest): (Dt<_>, Dr<_>, Cell<_>);
+        c_shortest = Cell::new(1);
+
+        // Error: `c_shortest` dies too soon for the references in dtors to be valid.
+        dt = Dt("dt", &c_shortest);
+        //~^ ERROR `c_shortest` does not live long enough
+        dr = Dr("dr", &c_shortest);
+    }
+
+    {
+        let c_long;
+        let (mut pt, mut pr, c_shortest): (Pt<_, _>, Pr<_>, Cell<_>);
+        c_long = Cell::new(1);
+        c_shortest = Cell::new(1);
+
+        // No error: Drop impl asserts .1 (A and &'a _) are not accessed
+        pt = Pt("pt", &c_shortest, &c_long);
+        pr = Pr("pr", &c_shortest, &c_long);
+    }
+
+    {
+        let c_long;
+        let (mut pt, mut pr, c_shortest): (Pt<_, _>, Pr<_>, Cell<_>);
+        c_long = Cell::new(1);
+        c_shortest = Cell::new(1);
+        // Error: Drop impl's assertion does not apply to `B` nor `&'b _`
+        pt = Pt("pt", &c_long, &c_shortest);
+        //~^ ERROR `c_shortest` does not live long enough
+        pr = Pr("pr", &c_long, &c_shortest);
+    }
+
+    {
+        let (st, sr, c_shortest): (St<_>, Sr<_>, Cell<_>);
+        c_shortest = Cell::new(1);
+        // No error: St and Sr have no destructor.
+        st = St("st", &c_shortest);
+        sr = Sr("sr", &c_shortest);
+    }
+}
+
+fn use_imm<T>(_: &T) { }