arphaman added inline comments.
================
Comment at: include/clang/Tooling/ASTDiff/ASTDiffInternal.h:38
+ operator int() const { return Id; }
+ NodeId &operator++() { return ++this->Id, *this; }
+ NodeId &operator--() { return --this->Id, *this; }
----------------
NIT: You don't need `this` here or in `--` as well.
https://reviews.llvm.org/D34329
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