Commits on Nov 12, 2020

1. 🐛 Cannot call non-constexpr function in constexpr context …

   Problem:
   - gcc-8 gives the following error when compiling this function on all
     standards:
       test/std-format-test.cc: In member function 'constexpr auto std::formatter<S>::parse(std::format_parse_context&)':
       test/std-format-test.cc:112:17: error: call to non-'constexpr' function 'int isdigit(int)'
           if (!isdigit(c) || (++iter, get_char()) != '}')
            ~~~~~~~^~~
   
   Solution:
   - Write a `constexpr` version of `isdigit` for use in this function.

   Jonathan Gopel committed Nov 12, 2020
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