Ali Mohammad Pur 70728b49e2 Shell: Move the heredocs vector to a local value before processing it ...

Otherwise we would end up trying to parse the same heredoc entry, if it
contained a sequence terminated by a newline.
e.g. `<<-x\n$({` would attempt to read a heredoc entry after `x`, and
then after `{` while inside the first heredoc entry.
To make this work, we can simply empty the instance vector and keep the
state on the stack.
Issue found through oss-fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33852

2021-05-01 15:58:31 +02:00

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