Thun/docs/reference/swaack.md

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## swaack
Basis Function
Swap stack. Take a list from the top of the stack, replace the stack
with the list, and put the old stack onto it.
### Example
1 2 3 [4 5 6] swaack
--------------------------
6 5 4 [3 2 1]
### Discussion
This function works as a kind of "context switch". It's used in the
definition of [infra].
### Crosslinks
[infra]