I've been experimenting with using interpolated strings to define hashes. I'm curious why the variation defining %kv below works. There's something about the colon, which I think is a pair constructor (?) and the square brackets that I'm not getting. 

#!/usr/bin/perl6

use v6;

my ($hkey, $hval ) = <somekey someval>;

# simple form:
#  my %kv = $hkey, $hval;   # works

my %kv = :[$hkey],$hval;    # works

#  my %kv = :$hkey,$hval;   # error
#  my %kv = :{$hkey},$hval; # _block83 someval

say %kv; # somekey someval

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In reply to Perl 6, defining a hash with interpolated string by Mr_Micawber

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