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default, var1, value1 [, var2, value2 ] …
Assigns values value1, value2 … to
variables var1, var2 …, but only for
those value1 etcetera that are undefined.
value1 etcetera may refer to possibly undefined earlier
var1: the values to be assigned are only evaluated just
before they are to be assigned to the variables. For instance,
default,a,5,b,2*a works fine even if both a and b
are undefined beforehand. In this case, a gets the value 5
and then b gets the value 10.