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while ( my ( $k, $v ) = each( %h ) ) {
  ...
}

while ( my ( $k, $v ) = each( %{ create_new_hash() } ) ) {
  ...
}

while ( my ( $k, $v ) = each( %h ) ) {
  ...
}

my $iter = get_iter( \%hash );
while ( my ( $k, $v ) = $iter->() ) {
   ...
}

using ( var iter = dict.GetEnumerator() ) {
   while ( iter.MoveNext() ) {
...
      ...
   }
}

foreach ( var entry in dict ) {
   ...
}