This was originally an attempt to reduce the compile time of this
translation unit, but apparently it doesn't work. Still, it has
the effect of converting stack traces that say "set_storage_service"
and refer to some lambda to stack traces that refer to the operation
being performed, so it's a net positive.
To faciliate the change, we introduce new functions rest_bind(),
similar to (and in fact wrapping) std::bind_front(), that capture
references like the lambdas did originally. We can't use
std::bind_front directly since the call to
seastar::httpd::path_description::set() cannot be disambiguated
after the function is obscured by the template returned by
std::bind_front. The new function rest_bind() has constraints
to understand which overload is in use.
Closesscylladb/scylladb#22526
f25636884a