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, 26 insertions, 0 deletions

diff --git a/src/test/ui/hrtb/hrtb-identity-fn-borrows.rs b/src/test/ui/hrtb/hrtb-identity-fn-borrows.rs
new file mode 100644
index 000000000..89fc4705a
--- /dev/null
+++ b/src/test/ui/hrtb/hrtb-identity-fn-borrows.rs
@@ -0,0 +1,26 @@
+// Test that the `'a` in the where clause correctly links the region
+// of the output to the region of the input.
+
+trait FnLike<A,R> {
+    fn call(&self, arg: A) -> R;
+}
+
+fn call_repeatedly<F>(f: F)
+    where F : for<'a> FnLike<&'a isize, &'a isize>
+{
+    // Result is stored: cannot re-assign `x`
+    let mut x = 3;
+    let y = f.call(&x);
+    x = 5; //~ ERROR cannot assign to `x` because it is borrowed
+
+    // Result is not stored: can re-assign `x`
+    let mut x = 3;
+    f.call(&x);
+    f.call(&x);
+    f.call(&x);
+    x = 5;
+    drop(y);
+}
+
+fn main() {
+}