foo.cc: In function 'int main()':
foo.cc:24:36: error: no match for 'operator=' (operand types are 'data' and '<brace-enclosed initializer list>')
   24 |         w[i] = {a, d, e, b, c, f, 0};
      |                                    ^
foo.cc:4:8: note: candidate: 'data& data::operator=(const data&)'
    4 | struct data
      |        ^~~~
foo.cc:4:8: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const data&'
foo.cc:4:8: note: candidate: 'data& data::operator=(data&&)'
foo.cc:4:8: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'data&&'

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