loop8: add a test for destructuring bind
220.127.116.11 Destructuring states
Destructuring allows binding of a set of variables to a corresponding set of values anywhere that a value can normally be bound to a single variable. During loop expansion, each variable in the variable list is matched with the values in the values list. If there are more variables in the variable list than there are values in the values list, the remaining variables are given a value of nil. If there are more values than variables listed, the extra values are discarded.
These tests check, whether loop accepts destructuring bindings where there is less values than variables.