Allows a loop expression to be nested in this loop expression.
When referencing input loops, every level of input looping that is an ancestor to the referenced loop must have a corresponding loop expression in the output. The nesting capability provides a way to refer to multiple input loops within a single loop expression.
Though this function specifies variable arguments, it can have exactly one argument, which is a loop function.
This function can only be used in the Contexts argument of a loop expression.
Arguments
| Variable arguments | Add a loop expression to use as a nested context. |