1 files changed, 24 insertions, 0 deletions

diff --git a/tests/codegen-llvm/issues/issue-105386-ub-in-debuginfo.rs b/tests/codegen-llvm/issues/issue-105386-ub-in-debuginfo.rs
new file mode 100644
index 00000000000..848aa910b58
--- /dev/null
+++ b/tests/codegen-llvm/issues/issue-105386-ub-in-debuginfo.rs
@@ -0,0 +1,24 @@
+//@ compile-flags: --crate-type=lib -Copt-level=3 -Cdebuginfo=2 -Cno-prepopulate-passes -Zmir-enable-passes=-ScalarReplacementOfAggregates
+// MIR SROA will decompose the closure
+#![feature(stmt_expr_attributes)]
+
+pub struct S([usize; 8]);
+
+#[no_mangle]
+pub fn outer_function(x: S, y: S) -> usize {
+    (#[inline(always)]
+    || {
+        let _z = x;
+        y.0[0]
+    })()
+}
+
+// Check that we do not attempt to load from the spilled arg before it is assigned to
+// when generating debuginfo.
+// CHECK-LABEL: @outer_function
+// CHECK: [[spill:%.*]] = alloca
+// CHECK-NOT: [[ptr_tmp:%.*]] = getelementptr inbounds i8, ptr [[spill]]
+// CHECK-NOT: [[load:%.*]] = load ptr, ptr
+// CHECK: call void @llvm.lifetime.start{{.*}}({{.*}}, ptr [[spill]])
+// CHECK: [[inner:%.*]] = getelementptr inbounds i8, ptr [[spill]]
+// CHECK: call void @llvm.memcpy{{.*}}(ptr {{align .*}} [[inner]], ptr {{align .*}} %x