The standard requires these constructors and accessors to be noexcept.
libstdc++-v3/ChangeLog:
* include/std/scoped_allocator (scoped_allocator_adaptor): Add
noexcept to all constructors except the default constructor.
(scoped_allocator_adaptor::inner_allocator): Add noexcept.
(scoped_allocator_adaptor::outer_allocator): Likewise.
* testsuite/20_util/scoped_allocator/noexcept.cc: New test.