Move array-slice-vec-related tests

src/test/ui/array-slice-vec/array_const_index-1.rs

@@ -1,12 +1,8 @@
-// run-pass
-#![allow(dead_code)]
-#![allow(stable_features)]
-
-#![feature(const_indexing)]
+const A: [i32; 0] = [];
+const B: i32 = A[1];
+//~^ index out of bounds: the length is 0 but the index is 1
+//~| ERROR any use of this value will cause an error
 
 fn main() {
-    const ARR: [i32; 6] = [42, 43, 44, 45, 46, 47];
-    const IDX: usize = 3;
-    const VAL: i32 = ARR[IDX];
-    const BLUB: [i32; (ARR[0] - 41) as usize] = [5];
+    let _ = B;
 }

src/test/ui/array-slice-vec/array_const_index-2.rs

@@ -0,0 +1,12 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(stable_features)]
+
+#![feature(const_indexing)]
+
+fn main() {
+    const ARR: [i32; 6] = [42, 43, 44, 45, 46, 47];
+    const IDX: usize = 3;
+    const VAL: i32 = ARR[IDX];
+    const BLUB: [i32; (ARR[0] - 41) as usize] = [5];
+}

src/test/ui/array_const_index-1.rs

@@ -1,8 +0,0 @@
-const A: [i32; 0] = [];
-const B: i32 = A[1];
-//~^ index out of bounds: the length is 0 but the index is 1
-//~| ERROR any use of this value will cause an error
-
-fn main() {
-    let _ = B;
-}