Nonterminating alias

[Dan Douglas]

A simpler one this time. Bash 4.4 only.

 $ bash -c $'alias @="eval {\n}"; eval @'
bash: xrealloc: cannot allocate 18446744071562068464 bytes

I would guess this is part of the way keywords are supposed to be
re-interpolated after alias expansion since 4.4. Maybe not even be a
bug depending on how I'm supposed to look at this.