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/nll/issue-54556-stephaneyfx.rs b/tests/ui/nll/issue-54556-stephaneyfx.rs
new file mode 100644
index 000000000..b758228e4
--- /dev/null
+++ b/tests/ui/nll/issue-54556-stephaneyfx.rs
@@ -0,0 +1,35 @@
+// This is a reduction of a concrete test illustrating a case that was
+// annoying to Rust developer stephaneyfx (see issue #46413).
+//
+// With resolving issue #54556, pnkfelix hopes that the new diagnostic
+// output produced by NLL helps to *explain* the semantic significance
+// of temp drop order, and thus why storing the result in `x` and then
+// returning `x` works.
+
+pub struct Statement;
+
+pub struct Rows<'stmt>(&'stmt Statement);
+
+impl<'stmt> Drop for Rows<'stmt> {
+    fn drop(&mut self) {}
+}
+
+impl<'stmt> Iterator for Rows<'stmt> {
+    type Item = String;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+fn get_names() -> Option<String> {
+    let stmt = Statement;
+    let rows = Rows(&stmt); //~ ERROR does not live long enough
+    rows.map(|row| row).next()
+    // let x = rows.map(|row| row).next();
+    // x
+    //
+    // Removing the map works too as does removing the Drop impl.
+}
+
+fn main() {}