View source for cpp/thread/unique lock/operator=

===Defect reports===
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{{dr list item|wg=lwg|dr=2104|std=C++11|before=the move assignment operator was {{c/core|noexcept}}, but it may<br>throw an exception in the case of undefined behavior<ref>For example, {{c|*this}} is constructed with {{lc|std::adopt_lock}}, but the calling thread does not have the ownership of the associated mutex. In this case, {{c|*this}} cannot properly release the ownership of the associated mutex, and it may result in an exception to be thrown.</ref>|after=it is not {{c/core|noexcept}}}}
{{dr list end}}
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