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my %hash = undef;

my %hash = ( key => "value", key2 => "value2" );   # OK
my %hash = ( "key", "value", "key2", "value2" );   # OK (same)
my %hash = ( "key", "value", "key2" );             # WRONG - gives the
+ error you describe
my %hash = ( undef );                              # WRONG - equivalen
+t to what you were doing!

undef %hash;
%hash = ();         # empty list = empty hash