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, 29 insertions, 0 deletions

diff --git a/src/test/ui/regions/regions-infer-contravariance-due-to-decl.rs b/src/test/ui/regions/regions-infer-contravariance-due-to-decl.rs
new file mode 100644
index 000000000..fbc0cec56
--- /dev/null
+++ b/src/test/ui/regions/regions-infer-contravariance-due-to-decl.rs
@@ -0,0 +1,29 @@
+// Test that a type which is contravariant with respect to its region
+// parameter yields an error when used in a covariant way.
+//
+// Note: see variance-regions-*.rs for the tests that check that the
+// variance inference works in the first place.
+
+use std::marker;
+
+// This is contravariant with respect to 'a, meaning that
+// Contravariant<'foo> <: Contravariant<'static> because
+// 'foo <= 'static
+struct Contravariant<'a> {
+    marker: marker::PhantomData<&'a()>
+}
+
+fn use_<'short,'long>(c: Contravariant<'short>,
+                      s: &'short isize,
+                      l: &'long isize,
+                      _where:Option<&'short &'long ()>) {
+
+    // Test whether Contravariant<'short> <: Contravariant<'long>.  Since
+    // 'short <= 'long, this would be true if the Contravariant type were
+    // covariant with respect to its parameter 'a.
+
+    let _: Contravariant<'long> = c;
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn main() {}