Hopefully people coming from Perl 5 will be using syntax-highlighting editors, so they will be able to see at a glance what is and isn't an identifier. :)

As for languages that allow dashes in identifiers, what about LISP, Scheme, etc? And languages like ML allow single quotes in identifiers (without even the requirement that they be followed by a letter).

In reply to Re^5: Syntax Highlighting Editors Beware by Porculus
in thread Syntax Highlighting Editors Beware by John M. Dlugosz

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