Add test for issue #27130

diff --git a/src/test/codegen/issue-27130.rs b/src/test/codegen/issue-27130.rs
new file mode 100644 (file)
index 0000000..466245a
--- /dev/null
+++ b/src/test/codegen/issue-27130.rs
@@ -0,0 +1,22 @@
+// compile-flags: -O
+// min-llvm-version: 11.0
+
+#![crate_type = "lib"]
+
+// CHECK-LABEL: @trim_in_place
+#[no_mangle]
+pub fn trim_in_place(a: &mut &[u8]) {
+    while a.first() == Some(&42) {
+        // CHECK-NOT: slice_index_order_fail
+        *a = &a[1..];
+    }
+}
+
+// CHECK-LABEL: @trim_in_place2
+#[no_mangle]
+pub fn trim_in_place2(a: &mut &[u8]) {
+    while let Some(&42) = a.first() {
+        // CHECK-NOT: slice_index_order_fail
+        *a = &a[1..];
+    }
+}