================
@@ -45,6 +45,34 @@ void fallthrough(int n) {
#endif
}
+namespace cwg2428 { // cwg2428: 19
+#if __cplusplus >= 202002L
+template <typename>
+concept C [[deprecated]] = true; // #C
----------------
AaronBallman wrote:
I'd like an additional test for rejecting:
```
template <typename>
[[deprecated]] concept C = true;
```
which isn't allowed per the grammar (though I find this slightly surprising and
it may be an oversight from WG21).
It would also be good to have a test explicitly showing that we reject
non-C++-style attributes.
https://github.com/llvm/llvm-project/pull/92295
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