================
@@ -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.
+ */
----------------
AaronBallman wrote:
Good call, I'll add these tests. FWIW, I already show constant folding:
```
// Constant folding works the same way as sizeof, too.
const int m = 12;
int other_array[m];
static_assert(sizeof(other_array)); // expected-error {{static assertion
expression is not an integral constant expression}}
static_assert(_Countof(other_array)); // expected-error {{static assertion
expression is not an integral constant expression}}
static_assert(sizeof(int[m])); // expected-error {{static assertion
expression is not an integral constant expression}}
static_assert(_Countof(int[m])); // expected-error {{static assertion
expression is not an integral constant expression}}
```
or did you have something else in mind?
https://github.com/llvm/llvm-project/pull/133125
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