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, 21 insertions, 0 deletions

diff --git a/src/test/ui/regions/regions-variance-invariant-use-covariant.rs b/src/test/ui/regions/regions-variance-invariant-use-covariant.rs
new file mode 100644
index 000000000..ab6a82ee7
--- /dev/null
+++ b/src/test/ui/regions/regions-variance-invariant-use-covariant.rs
@@ -0,0 +1,21 @@
+// Test that a type which is invariant with respect to its region
+// parameter used in a covariant way yields an error.
+//
+// Note: see variance-regions-*.rs for the tests that check that the
+// variance inference works in the first place.
+
+struct Invariant<'a> {
+    f: &'a mut &'a isize
+}
+
+fn use_<'b>(c: Invariant<'b>) {
+
+    // For this assignment to be legal, Invariant<'b> <: Invariant<'static>.
+    // Since 'b <= 'static, this would be true if Invariant were covariant
+    // with respect to its parameter 'a.
+
+    let _: Invariant<'static> = c;
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn main() { }