#!/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