Merging upstream version 1.68.2+dfsg1.

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

1 files changed, 30 insertions, 0 deletions

diff --git a/tests/ui/nll/issue-27282-reborrow-ref-mut-in-guard.rs b/tests/ui/nll/issue-27282-reborrow-ref-mut-in-guard.rs
new file mode 100644
index 000000000..ac06b2b01
--- /dev/null
+++ b/tests/ui/nll/issue-27282-reborrow-ref-mut-in-guard.rs
@@ -0,0 +1,30 @@
+// Issue 27282: This is a variation on issue-27282-move-ref-mut-into-guard.rs
+//
+// It reborrows instead of moving the `ref mut` pattern borrow. This
+// means that our conservative check for mutation in guards will
+// reject it. But I want to make sure that we continue to reject it
+// (under NLL) even when that conservative check goes away.
+
+#![feature(if_let_guard)]
+
+fn main() {
+    let mut b = &mut true;
+    match b {
+        &mut false => {},
+        ref mut r if { (|| { let bar = &mut *r; **bar = false; })();
+        //~^ ERROR cannot borrow `r` as mutable, as it is immutable for the pattern guard
+                             false } => { &mut *r; },
+        &mut true => { println!("You might think we should get here"); },
+        _ => panic!("surely we could never get here, since rustc warns it is unreachable."),
+    }
+
+    let mut b = &mut true;
+    match b {
+        &mut false => {},
+        ref mut r if let Some(()) = { (|| { let bar = &mut *r; **bar = false; })();
+        //~^ ERROR cannot borrow `r` as mutable, as it is immutable for the pattern guard
+                             None } => { &mut *r; },
+        &mut true => {},
+        _ => {},
+    }
+}