1 files changed, 43 insertions, 0 deletions
diff --git a/tests/mir-opt/pre-codegen/clone_as_copy.rs b/tests/mir-opt/pre-codegen/clone_as_copy.rs
new file mode 100644
index 00000000000..f5ff1854d38
--- /dev/null
+++ b/tests/mir-opt/pre-codegen/clone_as_copy.rs
@@ -0,0 +1,43 @@
+//@ compile-flags: -Cdebuginfo=full
+
+// Check if we have transformed the nested clone to the copy in the complete pipeline.
+
+#[derive(Clone)]
+struct AllCopy {
+    a: i32,
+    b: u64,
+    c: [i8; 3],
+}
+
+#[derive(Clone)]
+struct NestCopy {
+    a: i32,
+    b: AllCopy,
+    c: [i8; 3],
+}
+
+#[derive(Clone)]
+enum Enum1 {
+    A(AllCopy),
+    B(NestCopy),
+}
+
+// EMIT_MIR clone_as_copy.clone_as_copy.PreCodegen.after.mir
+fn clone_as_copy(v: &NestCopy) -> NestCopy {
+    // CHECK-LABEL: fn clone_as_copy(
+    // CHECK-NOT: = AllCopy { {{.*}} };
+    // CHECK-NOT: = NestCopy { {{.*}} };
+    // CHECK: _0 = copy (*_1);
+    // CHECK: return;
+    v.clone()
+}
+
+// FIXME: We can merge into exactly one assignment statement.
+// EMIT_MIR clone_as_copy.enum_clone_as_copy.PreCodegen.after.mir
+fn enum_clone_as_copy(v: &Enum1) -> Enum1 {
+    // CHECK-LABEL: fn enum_clone_as_copy(
+    // CHECK-NOT: = Enum1::
+    // CHECK: _0 = copy (*_1);
+    // CHECK: _0 = copy (*_1);
+    v.clone()
+}