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This can happen when a syntactically incorrect text is passed to a
merl:qquote/2,/3 call.
The parse transform optimizes calls to some functions in merl by
converting strings into templates at compile time. If this evaluation
fails (in eval_call/4 - for example because of a sytanx error in the
parsed text) the original function call should be kept unchanged.
However in case of qquote/3 the call is converted into a combination of
quote/2 and subst/2, but upon failure the original qquote/3 call is
substituted into the wrong place. E.g.:
this expression
merl:qquote(Pos, Text, Env)
is first converted to
merl:subst(merl:quote(Pos, Text), Env)
then if evaluating the quote call fails into
merl:subst(merl:qquote(Pos, Text, Env), Env)
and the expansion is run again on the internal qquote/3 argument
resulting in an infinite loop.
This is now fixed so in case of failure the original qquote/3 call is kept.
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