From 40.1. PL/Perl Functions and Arguments
"The use of named nested subroutines is dangerous in Perl, especially if
they refer to lexical variables in the enclosing scope. Because a
PL/Perl function is wrapped in a subroutine, any named subroutine you
create will be nested. In general, it is far safer to create anonymous
subroutines which you call via a coderef. See the perldiag man page for
The reference to the "perldiag" doc is confusing because it's a
dictionary of errors. We need to be specific about what part of the page:
"See "Variable %s Will Not Stay Shared" and "Variable %s is not
available" in the perldiag man page for more details."
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