[clang] [C++20] [Modules] Warn for importing implementation partition unit in interface units (PR #108493)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff dee058f9e3ae95b8f4b95034b65c3d7408060c8e 2ce2ed721f1ee985aa6163331bcb1f2f666a3b62 --extensions cpp -- clang/lib/Sema/SemaModule.cpp clang/test/CXX/module/module.import/p2.cpp clang/test/Modules/cxx20-10-3-ex1.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaModule.cpp b/clang/lib/Sema/SemaModule.cpp
index 5748906748..9a80adbde6 100644
--- a/clang/lib/Sema/SemaModule.cpp
+++ b/clang/lib/Sema/SemaModule.cpp
@@ -652,8 +652,10 @@ DeclResult Sema::ActOnModuleImport(SourceLocation StartLoc,
 
   assert((!Mod->isModulePartitionImplementation() || getCurrentModule()) &&
          "We can only import a partition unit in a named module.");
-  if (Mod->isModulePartitionImplementation() && getCurrentModule()->isModuleInterfaceUnit())
-    Diag(ImportLoc, diag::warn_import_implementation_partition_unit_in_interface_unit);
+  if (Mod->isModulePartitionImplementation() &&
+      getCurrentModule()->isModuleInterfaceUnit())
+    Diag(ImportLoc,
+         diag::warn_import_implementation_partition_unit_in_interface_unit);
 
   checkModuleImportContext(*this, Mod, ImportLoc, CurContext);
 

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https://github.com/llvm/llvm-project/pull/108493