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Test \type{\rightarrowfill} and \type{\leftarrowfill}
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\ConTeXt\ \contextversion
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dotfill [\hbox to\textwidth{\dotfill}]
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dotfill [\hbox to5cm{\dotfill}]
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rightarrowfill [\hbox to5cm{\rightarrowfill}]
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leftarrowfill [\hbox to5cm{\leftarrowfill}]
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hrulefill [\hbox to5cm{\hrulefill}]
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rightarrowfill = \meaning\rightarrowfill
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leftarrowfill = \meaning\leftarrowfill
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