Snippets for folly 2026.07.27.00 from Nix x86_64-linux

Sourced from https://hydra.nixos.org/log/ym22rizd8jyf71awaf6myvvhw5z3xpp5-folly-2026.07.27.00.drv.

• /build/source/folly/coro/SerialQueueRunner.cpp:67:3: warning: '<anonymous>' may be used uninitialized [-Wmaybe-uninitialized]
     67 |   }
        |   ^
  

• /build/source/folly/io/FsUtil.cpp:121:19: warning: redundant move in return statement [-Wredundant-move]
    121 |   return std::move(result);
        |          ~~~~~~~~~^~~~~~~~
  

• /build/source/folly/io/async/EpollBackend.cpp:93:19: warning: ignoring return value of 'ssize_t write(int, const void*, size_t)' declared with attribute 'warn_unused_result' [-Wunused-result]
     93 |     fileops::write(fd, &sigNum, 1);
        |     ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
  

• /nix/store/7sh9061yj9yl20ndc00rqw4d0bd80m1j-gcc-15.3.0/include/c++/15.3.0/bits/stl_iterator.h:1059:9: warning: array subscript -2 is outside array bounds of 'std::vector<int, std::pmr::polymorphic_allocator<int> > [288230376151711743]' [-Warray-bounds=]
   1059 |       : _M_current(__i) { }
        |         ^~~~~~~~~~~~~~~
  

• /nix/store/7sh9061yj9yl20ndc00rqw4d0bd80m1j-gcc-15.3.0/include/c++/15.3.0/bits/stl_iterator.h:1059:9: warning: array subscript -3 is outside array bounds of 'std::vector<int, std::pmr::polymorphic_allocator<int> > [288230376151711743]' [-Warray-bounds=]
   1059 |       : _M_current(__i) { }
        |         ^~~~~~~~~~~~~~~
  

• /nix/store/7sh9061yj9yl20ndc00rqw4d0bd80m1j-gcc-15.3.0/include/c++/15.3.0/bits/stl_iterator.h:1059:9: warning: array subscript -2 is outside array bounds of 'folly::sorted_vector_map<int, int, std::less<int>, std::pmr::polymorphic_allocator<std::pair<int, int> >, void, std::vector<std::pair<int, int>, std::pmr::polymorphic_allocator<std::pair<int, int> > > > [288230376151711743]' [-Warray-bounds=]
   1059 |       : _M_current(__i) { }
        |         ^~~~~~~~~~~~~~~
  

• /nix/store/7sh9061yj9yl20ndc00rqw4d0bd80m1j-gcc-15.3.0/include/c++/15.3.0/bits/stl_iterator.h:1059:9: warning: array subscript -3 is outside array bounds of 'folly::sorted_vector_map<int, int, std::less<int>, std::pmr::polymorphic_allocator<std::pair<int, int> >, void, std::vector<std::pair<int, int>, std::pmr::polymorphic_allocator<std::pair<int, int> > > > [288230376151711743]' [-Warray-bounds=]
   1059 |       : _M_current(__i) { }
        |         ^~~~~~~~~~~~~~~
  

• /nix/store/7sh9061yj9yl20ndc00rqw4d0bd80m1j-gcc-15.3.0/include/c++/15.3.0/bits/stl_iterator.h:1059:9: warning: array subscript -2 is outside array bounds of 'folly::sorted_vector_set<int, std::less<int>, std::pmr::polymorphic_allocator<int>, void, std::vector<int, std::pmr::polymorphic_allocator<int> > > [288230376151711743]' [-Warray-bounds=]
   1059 |       : _M_current(__i) { }
        |         ^~~~~~~~~~~~~~~
  

• /nix/store/7sh9061yj9yl20ndc00rqw4d0bd80m1j-gcc-15.3.0/include/c++/15.3.0/bits/stl_iterator.h:1059:9: warning: array subscript -3 is outside array bounds of 'folly::sorted_vector_set<int, std::less<int>, std::pmr::polymorphic_allocator<int>, void, std::vector<int, std::pmr::polymorphic_allocator<int> > > [288230376151711743]' [-Warray-bounds=]
   1059 |       : _M_current(__i) { }
        |         ^~~~~~~~~~~~~~~
  

• /build/source/folly/concurrency/test/AtomicSharedPtrCounted.h:153:11: warning: 'void free(void*)' called on a pointer to an unallocated object '18446744073709551608' [-Wfree-nonheap-object]
    153 |       free(counted_ptr_base<Atom>::getRef(base));
        |       ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  

• /build/source/folly/futures/test/Benchmark.cpp:350:8: warning: '<unnamed>.{anonymous}::Bulky::ints_' is used uninitialized [-Wuninitialized]
    350 | struct Bulky {
        |        ^~~~~
  

• /build/source/folly/futures/detail/Core.h:670:15: warning: 'this' pointer is null [-Wnonnull]
    670 |     setResult_(std::move(completingKA));
        |     ~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
  

• /build/source/folly/MPMCQueue.h:784:31: warning: 'pipeline.folly::gen::detail::PMap<FibSumPmap::._anon_392>::Generator<const int&, folly::gen::detail::Sequence<int, folly::gen::detail::SeqImpl<int> >, int, long unsigned int>::ExecutionPipeline::pipeline_.folly::MPMCPipeline<int, folly::Expected<long unsigned int, std::__exception_ptr::exception_ptr> >::stages_.std::tuple<folly::detail::MPMCPipelineStageImpl<int>, folly::detail::MPMCPipelineStageImpl<folly::Expected<long unsigned int, std::__exception_ptr::exception_ptr> > >::<unnamed>.std::_Tuple_impl<0, folly::detail::MPMCPipelineStageImpl<int>, folly::detail::MPMCPipelineStageImpl<folly::Expected<long unsigned int, std::__exception_ptr::exception_ptr> > >::<unnamed>.std::_Head_base<0, folly::detail::MPMCPipelineStageImpl<int>, false>::_M_head_impl.folly::detail::MPMCPipelineStageImpl<int>::queue_.folly::MPMCQueue<int, std::atomic, false, std::allocator<int> >::<unnamed>.folly::detail::MPMCQueueBase<folly::MPMCQueue<int, std::atomic, false, std::allocator<int> > >::<anonymous>.folly::detail::MPMCQueueBase<folly::MPMCQueue<int, std::atomic, false, std::allocator<int> > >::<unnamed union>::slots_' may be used uninitialized [-Wmaybe-uninitialized]
    784 |   ~MPMCQueueBase() { delete[] slots_; }
        |                               ^~~~~~
  

• /build/source/folly/stats/test/BufferedStatTest.cpp:54:28: warning: 'SR.4144' may be used uninitialized [-Wmaybe-uninitialized]
     54 |     SimpleDigest digest(100);
        |                            ^
  

• /build/source/folly/FBString.h:620:11: warning: array subscript 985 is above array bounds of 'char [24]' [-Warray-bounds=]
    620 |     small_[s] = '\0';
        |     ~~~~~~^
  

• /build/source/folly/Range.h:1103:14: warning: array subscript -3 is outside array bounds of 'char [28]' [-Warray-bounds=]
   1103 |     std::copy(replacement.begin(), replacement.end(), begin() + pos);
        |     ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~