================
@@ -0,0 +1,68 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c2y -pedantic -Wall -Wno-comment -verify 
%s
+
+/* WG14 N3369: Clang 21
+ * _Lengthof operator
+ *
+ * Adds an operator to get the length of an array. Note that WG14 N3469 renamed
+ * this operator to _Countof.
+ */
----------------
cor3ntin wrote:

More tests for you to consider:

 - unspecified arrays length
 - arrays of rank 3
 - `_Countof array`
 - typedefs
 - `static_assert(__is_same_as(typeof(_Countof(foo)), size_t))`
 - Constant folding tests

https://github.com/llvm/llvm-project/pull/133125
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