{ A => "b" }

##</code><code>##

do { my %anon = ( A => "b" ); \%anon }

##</code><code>##

my %anon = ( A => "b" );
my %keys = \%anon;

##</code><code>##

warn("Odd number of elements in hash assignment");
my %anon = ( A => "b" );
my %keys = ( \%anon => undef );

##</code><code>##

my %keys = %{  { A => "b" }  };

##</code><code>##

my %keys = ( A => "b" );