Fix the For optimizer, "include" function was always optimized
bug #1574 Fix the For optimizer, "include" function was always optimized (acasademont)

This PR was merged into the 1.16-dev branch.

Discussion
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Fix the For optimizer, "include" function was always optimized

A `for`with an in `include` function was always optimized, making it impossible to use the `loop` variable inside the include unless it was explicitly passed in the `include` function parameters.

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4319bb9 Fix the For optimizer, "include" function was always optimized