[perl #131517] [BUG] Perl5-ism regex range detector hides a more useful error

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https://irclog.perlgeek.de/perl6/2017-06-06#i_14692778

A more useful error in this case would be to say that quotes aren't special in 
meta chars;
and the "escape it" message should probably mention "with backslash", so the 
user doesn't think
they can use quotes to escape specialiness of the `-`:

araraloren      m: say "ABC/as" ~~ m/<-["/" "-" "."]>+/;
camelia         rakudo-moar e0f68e: OUTPUT: «5===SORRY!5=== Error while 
compiling <tmp>␤Unsupported use of - as character range; in Perl 6 please use 
.. for range, for explicit - in character class, escape it or place it as the 
first or last thing␤at <tmp>:1␤------> 3say "ABC/as" ~~ m/<-…»