1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/ui/sanitize/memory-eager.rs b/src/test/ui/sanitize/memory-eager.rs
new file mode 100644
index 000000000..cc0593ec0
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+++ b/src/test/ui/sanitize/memory-eager.rs
@@ -0,0 +1,38 @@
+// needs-sanitizer-support
+// needs-sanitizer-memory
+// min-llvm-version: 14.0.0
+//
+// revisions: unoptimized optimized
+//
+// [optimized]compile-flags: -Z sanitizer=memory -Zsanitizer-memory-track-origins -O
+// [unoptimized]compile-flags: -Z sanitizer=memory -Zsanitizer-memory-track-origins
+//
+// run-fail
+// error-pattern: MemorySanitizer: use-of-uninitialized-value
+// error-pattern: Uninitialized value was created by an allocation
+// error-pattern: in the stack frame
+//
+// This test case intentionally limits the usage of the std,
+// since it will be linked with an uninstrumented version of it.
+
+#![feature(core_intrinsics)]
+#![feature(start)]
+#![feature(bench_black_box)]
+
+use std::hint::black_box;
+use std::mem::MaybeUninit;
+
+#[inline(never)]
+#[no_mangle]
+#[allow(invalid_value)]
+fn random() -> char {
+    let r = unsafe { MaybeUninit::uninit().assume_init() };
+    // Avoid optimizing everything out.
+    black_box(r)
+}
+
+#[start]
+fn main(_: isize, _: *const *const u8) -> isize {
+    random();
+    0
+}