Auto merge of #101152 - Dylan-DPC:rollup-v4iw8ux, r=Dylan-DPC

Rollup of 8 pull requests

Successful merges:

 - #98304 (Add MaybeUninit memset test)
 - #98801 (Add a `File::create_new` constructor)
 - #99821 (Remove separate indexing of early-bound regions)
 - #100239 (remove an ineffective check in const_prop)
 - #100337 (Stabilize `std::io::read_to_string`)
 - #100819 (Make use of `[wrapping_]byte_{add,sub}`)
 - #100934 (Remove a panicking branch from `fmt::builders::PadAdapter`)
 - #101000 (Separate CountIsStar from CountIsParam in rustc_parse_format.)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 11 insertions, 0 deletions

diff --git a/src/test/codegen/issue-96274.rs b/src/test/codegen/issue-96274.rs
new file mode 100644
index 00000000000..e3abf730961
--- /dev/null
+++ b/src/test/codegen/issue-96274.rs
@@ -0,0 +1,11 @@
+// min-llvm-version: 15.0
+// compile-flags: -O
+
+#![crate_type = "lib"]
+
+use std::mem::MaybeUninit;
+
+pub fn maybe_uninit() -> [MaybeUninit<u8>; 3000] {
+    // CHECK-NOT: memset
+    [MaybeUninit::uninit(); 3000]
+}