Variables and includes

Is it possible to use a variable from one configuration in a included
config file? Example:

set $a = "hello";
include test.conf;

[test.conf]
if ($a = "hello") {
set $a = "world";
}
# something that works with $a

Within the scope of the commands of test.conf, will $a be "hello" or
"world"? Currently my usage like this gives me a, "using unitialized
variable" warning.
--
Daniel

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