replace PDL::Lvalue pure-Perl entries with ":lvalue" decoration

Basic/lib/PDL/Core.pm

@@ -1601,7 +1601,7 @@ positive indices.
 
 =cut
 
-sub PDL::dummy($$;$) {
+sub PDL::dummy($$;$) :lvalue {
    my ($pdl,$dim,$size) = @_;
    barf("Missing position argument to dummy()") unless defined $dim;  # required argument
    $dim = $pdl->getndims+1+$dim if $dim < 0;
@@ -1737,7 +1737,7 @@ Data flows back and forth as usual with slicing routines.
 
 =cut
 
-sub PDL::clump {
+sub PDL::clump :lvalue {
   goto &PDL::_clump_int if @_ < 3;
   my ($this,@dims) = @_;
   my $ndims = $this->getndims;
@@ -1898,10 +1898,6 @@ Explicit broadcasting over specified dims using broadcast id 1.
 
  $xx = $x->broadcast1(3,1)
 
-=for example
-
- Wibble
-
 Convenience function interfacing to
 L<PDL::Slices::broadcastI|PDL::Slices/broadcastI>.
 
@@ -2469,7 +2465,7 @@ and/or changed to "slice_if_pdl" for PDL 3.0.
 
 =cut
 
-sub PDL::nslice_if_pdl {
+sub PDL::nslice_if_pdl :lvalue {
    my ($pdl) = shift;
    my ($orig_args) = pop;
 
@@ -2982,7 +2978,7 @@ then the connection is first severed.
 =cut
 
 *reshape = \&PDL::reshape;
-sub PDL::reshape {
+sub PDL::reshape :lvalue {
     my $pdl = topdl($_[0]);
     if (@_ == 2 && $_[1] == -1) {  # a slicing reshape that drops 1-dims
 	return $pdl->slice( map $_==1 ? [0,0,0] : [], $pdl->dims);
@@ -3042,7 +3038,7 @@ Falls through if argument already == 1D.
 =cut
 
 *flat = \&PDL::flat;
-sub PDL::flat { # fall through if < 2D
+sub PDL::flat :lvalue { # fall through if < 2D
   return my $dummy = $_[0]->getndims != 1 ? $_[0]->clump(-1) : $_[0];
 }
 

Basic/lib/PDL/Dbg.pm

@@ -97,7 +97,7 @@ For historical reasons C<vars> is an alias for C<px>.
 
 =cut
 
-sub px {
+sub px :lvalue {
   my $arg = shift;
   my $str="";
 
@@ -145,8 +145,6 @@ Alias for C<px>
 
 =cut
 
-# make vars an alias
-# I hope this works with inheritance
 *vars = \&px;
 
 1; # return success

Basic/lib/PDL/Lvalue.pm

@@ -32,12 +32,11 @@ use warnings;
 
 # list of functions that can be used as lvalue subs
 # extend as necessary
-my @funcs = qw/ clump diagonal dice dice_axis dummy flat
-                index index2d indexND mv
+my @funcs = qw/
+                index index2d mv
                 broadcast unbroadcast
-                nslice_if_pdl px
-                range rangeb reorder reshape sever slice
-                where whereND xchg /;
+                rangeb sever
+                xchg /;
 
 my $prots = join "\n", map {"use attributes 'PDL', \\&PDL::$_, 'lvalue';"}
   @funcs;

Basic/lib/PDL/Primitive.pd

@@ -3677,7 +3677,7 @@ broadcast over a smaller mask, for example.
 
 =cut
 
-sub PDL::where {
+sub PDL::where :lvalue {
   barf "Usage: where( \$pdl1, ..., \$pdlN, \$mask )\n" if @_ == 1;
   my $mask = pop->flat->which;
   @_ == 1 ? $_[0]->flat->index($mask) : map $_->flat->index($mask), @_;

Basic/lib/PDL/Slices.pd

@@ -268,14 +268,14 @@ PDL, suitable for feeding to this.
 
 =cut
 
-sub PDL::indexND {
+sub PDL::indexND :lvalue {
         my($source,$index, $boundary) = @_;
         return PDL::range($source,$index,undef,$boundary);
 }
 
 *PDL::indexNDb = \&PDL::indexND;
 
-sub PDL::range {
+sub PDL::range :lvalue {
   my($source,$ind,$sz,$bound) = @_;
   # Convert to indx type up front (also handled in rangeb if necessary)
   my $index = (ref $ind && UNIVERSAL::isa($ind,'PDL') && $ind->type eq 'indx') ? $ind : indx($ind);
@@ -1545,7 +1545,7 @@ result PDL will change the parent.
 
 =cut
 
-sub PDL::reorder {
+sub PDL::reorder :lvalue {
         my ($pdl,@newDimOrder) = @_;
 
         my $arrayMax = $#newDimOrder;
@@ -2036,7 +2036,7 @@ slice will change the parent (use the C<.=> operator).
 
 =cut
 
-sub PDL::dice {
+sub PDL::dice :lvalue {
 
         my $self = shift;
         my @dim_indexes = @_;  # array of dimension indexes
@@ -2112,7 +2112,7 @@ slice will change the parent.
 
 =cut
 
-sub PDL::dice_axis {
+sub PDL::dice_axis :lvalue {
   my($self,$axis,$idx) = @_;
   my $ix = PDL->topdl($idx);
   barf("dice_axis: index must be <=1D") if $ix->getndims > 1;
@@ -2287,7 +2287,7 @@ direct slicing even though the syntax is convenient.
  $x->slice([-2,1]);
 EOD-slice
         PMCode => pp_line_numbers(__LINE__, <<'EOD-slice'),
-sub PDL::slice {
+sub PDL::slice :lvalue {
     my ($source, @others) = @_;
     for my $i(0..$#others) {
       my $idx = $others[$i];
@@ -2502,7 +2502,7 @@ END
                 $SETDIMS();
         '),
         PMCode =>pp_line_numbers(__LINE__, <<'EOD'),
-sub PDL::diagonal { shift->_diagonal_int(my $o=PDL->null, \@_); $o }
+sub PDL::diagonal :lvalue { shift->_diagonal_int(my $o=PDL->null, \@_); $o }
 EOD
         Doc => <<'EOD',
 =for ref