Variables are lazy loaded so :
vars:
x: '{{ x + [1] }}'
will not work since the value of x is not known before you try to use
x creating a self referential loop.
But you can get around it with `set_fact` as we evaluate variables at
the time of module execution and set_fact is a module that sets a new
variable:
set_fact:
x : '{{ x + [1] }}'
this defines a 'new x' that is the 'old x + [1]' (add a list with the
number 1 as an element, assumes x is already a list, you might use
|default([]) if you are not assured x was previously defined
----------
Brian Coca
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