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This is a much simpler fix than discussed in bugzilla, just forward to _M_emplace() when inserting from a type that needs conversion to value_type. This also fixes the dangling reference problem as well as the regression with calling insert() with convertible types. PR libstdc++/56112 * include/bits/hashtable_policy.h (insert(_Pair&&)): Use _M_emplace to construct value_type explicitly before trying to extract the key. * testsuite/23_containers/unordered_map/cons/56112.cc: New. Tested x86_64-linux, will commit to trunk tomorrow. N.B. The dangling reference bug is present on the 4.6 and 4.7 branches, but not a regression.
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