llvm-namespace-comment

google-readability-namespace-comments redirects here as an alias for this check.

Checks that long namespaces have a closing comment.

https://llvm.org/docs/CodingStandards.html#namespace-indentation

https://google.github.io/styleguide/cppguide.html#Namespaces

namespace n1 {
void f();
}

// becomes

namespace n1 {
void f();
}  // namespace n1

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