[perl #126251] missing NYI makes shaped hashes error messages LTA

[via RT]

# New Ticket Created by  Wenzel Peppmeyer 
# Please include the string:  [perl #126251]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=126251 >


m: my %h{<a b c>};
# OUTPUT«===SORRY!=== Error while compiling /tmp/FOE9PcfY9f␤Invalid hash 
shape; type expected␤at 
/tmp/FOE9PcfY9f:1␤------>my %h{<a b c>}⏏;␤    expecting anof constraint␤»

# expected output NYI

m: my %h{'a', 'b', 'c'}; %h<e> = 666; %h.gist.say;
# OUTPUT«e => 666␤»
# expected output NYI or wrong keylist as this form is not specced