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View Compilation Error

0_0_36839590_30024.cpp: In static member function 'static constexpr mat mat::e()':
0_0_36839590_30024.cpp:12:95: error: no matching function for call to 'mat::mat(<brace-enclosed initializer list>)'
  static constexpr mat e(){return mat{{array<array<ll,2>,2>{array<ll,2>{1,0},array<ll,2>{0,1}}}};}
                                                                                               ^
0_0_36839590_30024.cpp:12:95: note: candidates are:
0_0_36839590_30024.cpp:10:8: note: mat::mat()
 struct mat
        ^
0_0_36839590_30024.cpp:10:8: note:   candidate expects 0 arguments, 1 provided
0_0_36839590_30024.cpp:10:8: note: constexpr mat::mat(const mat&)
0_0_36839590_30024.cpp:10:8: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const mat&'
0_0_36839590_30024.cpp:10:8: note: constexpr mat::mat(mat&&)
0_0_36839590_30024.cpp:10:8: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'mat&&'
0_0_36839590_30024.cpp:12:97: error: body of constexpr function 'static constexpr mat mat::e()' not a return-statement
  static constexpr mat e(){return mat{{array<array<ll,2>,2>{array<ll,2>{1,0},array<ll,2>{0,1}}}};}
                                                                                                 ^


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