[perl #125183] [BUG] Crash on no strict and multi-dimensional hash

[via RT]

# New Ticket Created by  Ron Schmidt 
# Please include the string:  [perl #125183]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=125183 >


Undeclared multi-dimensional hash under 'no strict;' causes crash.

perl6 -e '%h<a><b>'

or IRC evalbot

m: no strict; %h{"a"}{"b"}

both cases crash with error like

Use of Nil in string context at src/gen/m-BOOTSTRAP.nqp line 2235
Use of Nil in string context at src/gen/m-BOOTSTRAP.nqp line 2235
...
Use of Nil in string context at src/gen/m-BOOTSTRAP.nqp line 2235
Cannot call postcircumfix:<{ }>(Mu, "b"); none of these signatures match:
    (Any \SELF, Any \key)
    (Any \SELF, Any \key, \ASSIGN)
    ...
  in block <unit> at -e:1