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diff --git a/tests/ui/consts/issue-33903.rs b/tests/ui/consts/issue-33903.rs
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+++ b/tests/ui/consts/issue-33903.rs
@@ -0,0 +1,10 @@
+// check-pass
+#![allow(dead_code)]
+// Issue 33903:
+// Built-in indexing should be used even when the index is not
+// trivially an integer
+// Only built-in indexing can be used in constant expressions
+
+const FOO: i32 = [12, 34][0 + 1];
+
+fn main() {}