test-matlab-ts-mode--ei-classify-matrix-action-fun result:
---
L16  (numeric-m-matrix 1 nil nil 0)           |        ];  mat3 = [ ...
L17  (numeric-m-matrix 1 (3 4))               |        1,   2222; ...
L18  (numeric-m-matrix 1 (3 4))               |     333, 4; ...
L19  (numeric-m-matrix 1)                     |        ]; 
