RecUpdateInLoop1.xreate
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	Rec = type {x:: int, y:: int}.

	test = function(base:: int):: int; entry() {
	fields = intrinsic rec_fields("Rec"):: [string]; i12n(on()).

	result = loop fold(fields->field:: string, {undef, 0}->ctx):: {rec:: Rec, id:: int}
	{
	{ (ctx["rec"]::Rec) : {[field] = base + ctx["id"] }, ctx["id"]+1 }:: {rec:: Rec, id:: int}
	}.

	result["rec"]["y"]
	}