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make Perl_scalar() mostly non-recursive
author
David Mitchell
<davem@iabyn.com>
Tue, 28 May 2019 14:23:44 +0000
(15:23 +0100)
committer
David Mitchell
<davem@iabyn.com>
Mon, 24 Jun 2019 10:40:07 +0000
(11:40 +0100)
Where it just recursively calls scalar() on all its children, instead
iteratively walk the sub-tree, using o->op_sibparent to work back
upwards.
Where it is more complex, such as OP_REPEAT imposing scalar context on its
first arg but not its second, recurse as before.
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