Replaces every simple subscript index in x[i] or x[[i]] with
x[i + 1L] / x[[i + 1L]]. Targets identifier and numeric literal indices;
complex expressions (e.g. x[a + b]) are left untouched.
Details
Catches off-by-one errors where tests never verify the exact element
retrieved from a vector or list.
Examples
index_increment()
#> Mutator: x[<i>] → x[<i> + 1L]
#> Query: [(subset arguments: (arguments (argument value: [(identifier) (float) (integer)] @index))) (subset2 arguments: (arguments (argument value: [(identifier) (float) (integer)] @index)))]
