id summary reporter owner description type status milestone component version severity resolution keywords cc 10493 Since 1.56, any_range with non-reference references can cause UB nofitserov@… Neil Groves "This must be related to #10360. This is a regression since 1.55. When using any_range, mutable dereference() method returns mutable_reference_type_generator::type, which becomes T&. So dereference() returns a dangling reference to an on-the-fly computed value. See attached test case, which works with 1.55, and fails with -fsanitize=address on Clang 3.5 with 1.56. {{{ #include #include #include #include typedef boost::any_range< std::string, boost::forward_traversal_tag, std::string, std::ptrdiff_t > range_t; std::string f(std::string a) { return a + ""!""; } int main() { std::vector v = {""a"", ""b""}; range_t r = v | boost::adaptors::transformed(f); for (auto&& a : r) std::cout << a << std::endl; return 0; } }}} " Bugs assigned Boost 1.64.0 range Boost 1.62.0 Regression p.omta@…