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, 51 insertions, 0 deletions

diff --git a/src/test/ui/borrowck/borrowck-lend-flow-if.rs b/src/test/ui/borrowck/borrowck-lend-flow-if.rs
new file mode 100644
index 000000000..19a0dd0c6
--- /dev/null
+++ b/src/test/ui/borrowck/borrowck-lend-flow-if.rs
@@ -0,0 +1,51 @@
+// Note: the borrowck analysis is currently flow-insensitive.
+// Therefore, some of these errors are marked as spurious and could be
+// corrected by a simple change to the analysis.  The others are
+// either genuine or would require more advanced changes.  The latter
+// cases are noted.
+
+
+
+fn borrow(_v: &isize) {}
+fn borrow_mut(_v: &mut isize) {}
+fn cond() -> bool { panic!() }
+fn for_func<F>(_f: F) where F: FnOnce() -> bool { panic!() }
+fn produce<T>() -> T { panic!(); }
+
+fn inc(v: &mut Box<isize>) {
+    *v = Box::new(**v + 1);
+}
+
+fn pre_freeze_cond() {
+    // In this instance, the freeze is conditional and starts before
+    // the mut borrow.
+
+    let u = Box::new(0);
+    let mut v: Box<_> = Box::new(3);
+    let mut _w = &u;
+    if cond() {
+        _w = &v;
+    }
+    borrow_mut(&mut *v); //~ ERROR cannot borrow
+    _w.use_ref();
+}
+
+fn pre_freeze_else() {
+    // In this instance, the freeze and mut borrow are on separate sides
+    // of the if.
+
+    let u = Box::new(0);
+    let mut v: Box<_> = Box::new(3);
+    let mut _w = &u;
+    if cond() {
+        _w = &v;
+    } else {
+        borrow_mut(&mut *v);
+    }
+    _w.use_ref();
+}
+
+fn main() {}
+
+trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { }  }
+impl<T> Fake for T { }