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Forbid variable names with ASCII non-graphic chars
See http://nntp.perl.org/group/perl.perl5.porters/229168
Also, the documentation has been updated beyond this change to clarify
related matters, based on some experimentation.
Previously, spaces couldn't be in variable names; now ASCII control
characters can't be either. The remaining permissible ASCII characters
in a variable name now must be all graphic ones.