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, 17 insertions, 0 deletions

diff --git a/src/test/ui/regions/regions-return-ref-to-upvar-issue-17403.stderr b/src/test/ui/regions/regions-return-ref-to-upvar-issue-17403.stderr
new file mode 100644
index 000000000..b087e03b4
--- /dev/null
+++ b/src/test/ui/regions/regions-return-ref-to-upvar-issue-17403.stderr
@@ -0,0 +1,17 @@
+error: captured variable cannot escape `FnMut` closure body
+  --> $DIR/regions-return-ref-to-upvar-issue-17403.rs:7:24
+   |
+LL |         let mut x = 0;
+   |             ----- variable defined here
+LL |         let mut f = || &mut x;
+   |                      - ^^^^^-
+   |                      | |    |
+   |                      | |    variable captured here
+   |                      | returns a reference to a captured variable which escapes the closure body
+   |                      inferred to be a `FnMut` closure
+   |
+   = note: `FnMut` closures only have access to their captured variables while they are executing...
+   = note: ...therefore, they cannot allow references to captured variables to escape
+
+error: aborting due to previous error
+