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ee97c332d9
because it has a member variable whose type is a reference. and a
reference cannot be reassigned. this silences following warning from Clang:
```
/home/kefu/dev/scylladb/test/boost/chunked_vector_test.cc:152:27: error: explicitly defaulted move assignment operator is implicitly deleted [-Werror,-Wdefaulted-function-deleted]
exception_safe_class& operator=(exception_safe_class&&) = default;
^
/home/kefu/dev/scylladb/test/boost/chunked_vector_test.cc:132:31: note: move assignment operator of 'exception_safe_class' is implicitly deleted because field '_esc' is of reference type 'exception_safety_checker &'
exception_safety_checker& _esc;
^
```
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>