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                                            Robin Thomas

Enforce getting the return value of a function

https://reviews.llvm.org/D41655 https://clang.llvm.org/extra/clang-tidy/checks/bugprone-unused-return-value.html. So not in clang 7 GCC has a `warn_unused_result` attribute, but it needs to be written in all function declarations. So may not be useful.