assigning an array using set_fact

[Cyril Scetbon]

Hi,

I'm trying to assign an array to a variable using set_fact as proposed at http://stackoverflow.com/a/23522774. However, it doesn't work as expected :

TASK: [set_fact roles="['dddd', 'eeeew', 'pffff', 'sssss']"] ************

ok: [master]

TASK: [set_fact roles="{{ roles + ['xxxx'] }}"] *******************************

fatal: [master] => Failed to template roles="{{ roles + ['xxxx'] }}": an unexpected type error occurred. Error was coercing to Unicode: need string or buffer, list found

The first set_fact assign a string to roles and not an array as expected ...