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{ A => "b" }

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

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

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

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

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