[clang] [C++20][Modules] Implement P1857R3 Modules Dependency Discovery (PR #107168)

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@@ -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
+    : Warning<"extra tokens at end of '%0' directive">,
+      InGroup<ExtraTokens>;
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yronglin wrote:

SGTM, I'll update this.

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