gap-system / gap / 11293

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travis-ci

kernel: fix `for` loop regression

... namely print warnings if the index variable `i` in a statement
of the form `for i in list do` is an undefined global.

To do this, move the code performing this check into a new helper
function `CheckUnboundGlobal`, and also use this opportunity to refactor
that check and add more comments to it.

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285784 of 337290 relevant lines covered (84.73%)

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