Parser does not handle recursive includes

[chmeeedalf]

Given the following files: a.conf: .include b.conf

b.conf: .include a.conf

The parser doesn't detect a loop, and instead crashes with a segmentation fault.

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[vstakhov]

I cannot reproduce it. When I create a recursive include ucl parser correctly produces the following error:

Error occurred (phase 1): maximum include nesting limit is reached: 17