[perl #128610] constant declarator doesn't like fully qualified names

[via RT]

# New Ticket Created by  Wenzel Peppmeyer 
# Please include the string:  [perl #128610]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=128610 >


constant B::b = 666;
# OUTPUT«===SORRY!=== Error while compiling <tmp>␤Missing initializer on 
constant declaration␤at <tmp>:1␤------> constant B:⏏:b = 666;␤»

# expected same behaviour as for
my $A::a = 42;