[PATCH] D132135: [clangd] Support hover on __func__ etc (PredefinedExpr)

[Sam McCall via Phabricator via cfe-commits]

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Expose these as variables as that's what the standard calls them (and D131175 <https://reviews.llvm.org/D131175>).

To make this work, we also fix a bug in SelectionTree: PredefinedExpr has
an implicit/invisible StringLiteral, and SelectionTree should not traverse
implicit things.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132135

Files:
  clang-tools-extra/clangd/Hover.cpp
  clang-tools-extra/clangd/Selection.cpp
  clang-tools-extra/clangd/unittests/HoverTests.cpp
  clang-tools-extra/clangd/unittests/SelectionTests.cpp

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