[PATCH] D137817: [clangd] Improve action `RemoveUsingNamespace` for user-defined literals

[v1nh1shungry via Phabricator via cfe-commits]

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If we are removing the namespace `ns1` and there are user-defined literals
declared in an inline namespace `ns2` declared in `ns1`, we can add a
`using namespace ns1::ns2;` to keep the program correct.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137817

Files:
  clang-tools-extra/clangd/refactor/tweaks/RemoveUsingNamespace.cpp
  clang-tools-extra/clangd/unittests/tweaks/RemoveUsingNamespaceTests.cpp

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