CombiHelper does not work properly

[joergen7]

The cross product evaluated by the program below should have the cardinality 9 and read

'0a' '0b' '0c' '1a' '1b' '1c' 2a' '2b' '2c'

but it doesn't. The problem probably arises in the CombiHelper class. Write a test case.

idx = 'a' 'b' 'c';

read = '0' '1' '2';

deftask align( out : read idx )in bash *{
    out="$read$idx"
}*

align(
    idx  : idx
    read : read
);