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d92204c900build: add warning to detect hidden copies in range-for loops (Cory Fields)466e16e0e8cleanup: avoid hidden copies in range-for loops (Cory Fields) Pull request description: Following-up on #13241, which was itself a follow-up of #12169. See title. Fixing these would otherwise be a continuous process, adding the warning should keep them from cropping up. Note that the warning seems to be Clang-only for now. Tree-SHA512: ccfb769c3128b3f92c95715abcf21ee2496fe2aa384f80efead1529a28eeb56b98995b531b49a089f8142601389e63f7bb935963d724eacde4f5e1b4a024934b