I can't found generator code of declaration of a new variable when I set a item to it

[johnrong]

Problem statement I use the block "variable_set" in variables category ,connecting with a custom block. But I can't declare a custom variable as I want 。

Expected Behavior when connecting with new block ，the block “variable_set" in in variables category should allow my declaration of new variable, not just basic type like,int ,String , and I wanna know where variable is declared or variable type is stored .so that I can declare a new variable like a array as I want.