================
@@ -466,6 +466,9 @@ def err_pp_embed_device_file : Error<
 
 def ext_pp_extra_tokens_at_eol : ExtWarn<
   "extra tokens at end of #%0 directive">, InGroup<ExtraTokens>;
+def ext_pp_extra_tokens_at_module_directive_eol
+    : ExtWarn<"extra tokens at end of '%0' directive">,
----------------
hubert-reinterpretcast wrote:

Based on the context of CWG2947, this is not an extension. This should be 
considered a `Warning` IIUC: 
https://releases.llvm.org/20.1.0/tools/clang/docs/InternalsManual.html#the-diagnostic-kinds-td-files.

There should be a test that programs that trigger this warning are accepted 
(with a warning) under `-pedantic-errors`.

Additionally, regardless of CWG2947, there is an issue with the wording of the 
message because the directive does not formally end with the first semicolon.

https://github.com/llvm/llvm-project/pull/107168
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