Implement LWG-4257: Stream insertion for chrono::local_time should be constrained #5895
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Constrain
operator<<(basic_ostream, chrono::local_time), require validity of underlying expression.Add tests.
Fixes #5854
Note: I've noticed that more often than not, requires clauses in the STL code are written before the function name, repeating the parameter list when necessary. I have placed the constraint after the function name and omitted the repetition of the parameter list. Please let me know whether this is preferred or not.