1 files changed, 24 insertions, 0 deletions
diff --git a/src/test/mir-opt/basic_assignment.rs b/src/test/mir-opt/basic_assignment.rs
new file mode 100644
index 000000000..ac350271e
--- /dev/null
+++ b/src/test/mir-opt/basic_assignment.rs
@@ -0,0 +1,24 @@
+// this tests move up progration, which is not yet implemented
+
+// EMIT_MIR basic_assignment.main.SimplifyCfg-initial.after.mir
+
+// Check codegen for assignments (`a = b`) where the left-hand-side is
+// not yet initialized. Assignments tend to be absent in simple code,
+// so subtle breakage in them can leave a quite hard-to-find trail of
+// destruction.
+
+fn main() {
+    let nodrop_x = false;
+    let nodrop_y;
+
+    // Since boolean does not require drop, this can be a simple
+    // assignment:
+    nodrop_y = nodrop_x;
+
+    let drop_x: Option<Box<u32>> = None;
+    let drop_y;
+
+    // Since the type of `drop_y` has drop, we generate a `replace`
+    // terminator:
+    drop_y = drop_x;
+}