Hi, I think this is a non-cosmetic change that deserves a specific feature test macro, because if it is missing, it can be worked around(*), so it's a candidate for conditional compilation for early adopters.
In case you agree, a proposal for the test macro could be __cpp_nontype_template_argument_auto. Does it sound good? Thanks for reading, Jordi Vilar (*) probably, everything could be worked around somehow, not just this :-)
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