================
@@ -3908,6 +3908,76 @@ directives:
// since-cxx17-note@#cwg92-p {{use 'noexcept(false)' instead}}
// cxx98-14-error@#cwg92-p {{target exception specification is not
superset of source}}
+
+Testing Modules (Serialization/Deserialization) When implementing a new C++
syntax
+----------------------------------------------------------------------------------
+
+When we implement a new C++ syntax, we need to make sure that it works
correctly with modules.
+This means that we need to test that the syntax can be serialized and
deserialized (if needed)
+correctly when used in a module. Otherwise, we can't claim the new C++ syntax
is supported.
----------------
AaronBallman wrote:
```suggestion
When implementing C++ functionality, it must work correctly with modules before
claiming the feature is fully supported.
This may require adding test coverage for serialization and deserialization of
C++ modules using the feature.
```
https://github.com/llvm/llvm-project/pull/200994
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