[Lang] Explicit new variable and hide variable #8662
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In many language e.g. rust, we can use
let a = 1to create a new variable. However, in taichi set the value of a variable and create a new variable writes in the same way.I made two hints:
taichi.newandtaichi.hidethat used in annoted assign to specify if we want to create a new variable in current scope or hide a variable in previous scope with a new variable.