1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/borrowck/disallow-possibly-uninitialized.rs b/tests/ui/borrowck/disallow-possibly-uninitialized.rs
new file mode 100644
index 00000000000..17de40d5ba9
--- /dev/null
+++ b/tests/ui/borrowck/disallow-possibly-uninitialized.rs
@@ -0,0 +1,22 @@
+// Test that we don't allow partial initialization.
+// This may be relaxed in the future (see #54987).
+
+fn main() {
+    let mut t: (u64, u64);
+    t.0 = 1;
+    //~^ ERROR E0381
+    t.1 = 1;
+
+    let mut t: (u64, u64);
+    t.1 = 1;
+    //~^ ERROR E0381
+    t.0 = 1;
+
+    let mut t: (u64, u64);
+    t.0 = 1;
+    //~^ ERROR E0381
+
+    let mut t: (u64,);
+    t.0 = 1;
+    //~^ ERROR E0381
+}