Summary: drop_begin depends on adl_begin/adl_end, which are defined in STLExtras.h, but we can't just #include STLExtras.h in iterator_range.h as that would introduce a circular reference (STLExtras.h already depends on iterator_range.h). The simplest solution is to move drop_begin into STLExtras.h, which is a reasonable home for it anyway. Reviewers: dblaikie Subscribers: dexonsmith, ributzka, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D70189
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