[matlab] Simulink the input and output variables of the same module cannot have the same name

For a simple example ：

Can run through ：

Test1

function y = fcn(u)

y = ones(3,4);

Test2

function y = fcn(u)

y = ones(4,3)*u;

Will report a mistake ：

Test1

function y = fcn(u)

y = ones(3,4);

Test2

function u = fcn(u)

u = ones(4,3)*u;

The fault of this times is Test2 Medium u Dimension mismatch
But it's strange , It's reasonable to say this u It should be directly covered , The original dimension should not be considered
Therefore, the input and output variables of the same module cannot have the same name , Probably Simulink The module in is so retarded

Of course, the result of the same name is more than that , This problem comes from my friend , He set the input and output with the same name , There is no error in that module , But the output will go wrong , I don't know how to engrave it again for a moment ……