Merging upstream version 1.68.2+dfsg1.

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

1 files changed, 35 insertions, 0 deletions

diff --git a/tests/ui/higher-rank-trait-bounds/hrtb-just-for-static.rs b/tests/ui/higher-rank-trait-bounds/hrtb-just-for-static.rs
new file mode 100644
index 000000000..8fb4218f8
--- /dev/null
+++ b/tests/ui/higher-rank-trait-bounds/hrtb-just-for-static.rs
@@ -0,0 +1,35 @@
+// Test a case where you have an impl of `Foo<X>` for all `X` that
+// is being applied to `for<'a> Foo<&'a mut X>`. Issue #19730.
+
+trait Foo<X> {
+    fn foo(&self, x: X) { }
+}
+
+fn want_hrtb<T>()
+    where T : for<'a> Foo<&'a isize>
+{
+}
+
+// AnyInt implements Foo<&'a isize> for any 'a, so it is a match.
+struct AnyInt;
+impl<'a> Foo<&'a isize> for AnyInt { }
+fn give_any() {
+    want_hrtb::<AnyInt>()
+}
+
+// StaticInt only implements Foo<&'static isize>, so it is an error.
+struct StaticInt;
+impl Foo<&'static isize> for StaticInt { }
+fn give_static() {
+    want_hrtb::<StaticInt>() //~ ERROR
+}
+
+// &'a u32 only implements Foo<&'a isize> for specific 'a, so it is an error.
+impl<'a> Foo<&'a isize> for &'a u32 { }
+fn give_some<'a>() {
+    want_hrtb::<&'a u32>()
+    //~^ ERROR lifetime may not live long enough
+    //~| ERROR implementation of `Foo` is not general enough
+}
+
+fn main() { }