Matthew Flatt 3d7ded8a33 extend load-xref to support multi-use on-demand information ... The result of `load-xref` with an on-demand function only made sense for a single use context, such as a single rendering request. Add an on-demand callback that can work right for multiple uses.		2020-05-24 11:06:23 -06:00
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scribble	extend load-xref to support multi-use on-demand information	2020-05-24 11:06:23 -06:00