[PATCH] D106201: [clangd] Add tests covering existing header-guard behavior. NFC

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
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A few different mechanisms here that will need some work to untangle:

- self-include in a preamble being an error even if the file is ifdef-guarded
- the is-include-guarded flag not being propagated from preamble to main ast
- preambles containing the first half on an include guard discard that info

For now just record current behavior.

Relevant to:

- https://github.com/clangd/clangd/issues/811
- https://github.com/clangd/clangd/issues/377
- https://github.com/clangd/clangd/issues/262


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D106201

Files:
  clang-tools-extra/clangd/unittests/ParsedASTTests.cpp

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