pp.c	TODO

  substr outside of string
    $a = "ab" ; $b = substr($a, 4,5) ;

  Attempt to use reference as lvalue in substr 
    $a = "ab" ; $b = \$a ;  substr($b, 1,1) = $b

  Use of uninitialized value in ref-to-glob cast	[pp_rv2gv()]
	*b = *{ undef()}

  Use of uninitialized value in scalar dereference	[pp_rv2sv()]
	my $a = undef ; my $b = $$a

  Odd number of elements in hash list
	my $a = { 1,2,3 } ;

  Explicit blessing to '' (assuming package main)
	bless \[], "";

  Constant subroutine %s undefined
	sub foo () { 1 }; undef &foo;

  Constant subroutine (anonymous) undefined
	$foo = sub () { 3 }; undef &$foo;

__END__
# pp.c
use warnings 'substr' ;
$a = "ab" ; 
$b = substr($a, 4,5) ;
no warnings 'substr' ;
$a = "ab" ; 
$b = substr($a, 4,5)  ;
EXPECT
substr outside of string at - line 4.
########
# pp.c
use warnings 'substr' ;
$a = "ab" ; 
$b = \$a ;  
substr($b, 1,1) = "ab" ;
no warnings 'substr' ;
substr($b, 1,1) = "ab" ;
EXPECT
Attempt to use reference as lvalue in substr at - line 5.
########
# pp.c
use warnings 'uninitialized' ;
*x = *{ undef() };
no warnings 'uninitialized' ;
*y = *{ undef() };
EXPECT
Use of uninitialized value in ref-to-glob cast at - line 3.
########
# pp.c
use warnings 'uninitialized';
$x = undef; $y = $$x;
no warnings 'uninitialized' ;
$u = undef; $v = $$u;
EXPECT
Use of uninitialized value $x in scalar dereference at - line 3.
########
# pp.c
use warnings 'misc' ;
my $a = { 1,2,3};
no warnings 'misc' ;
my $b = { 1,2,3};
EXPECT
Odd number of elements in anonymous hash at - line 3.
########
# pp.c
use warnings 'misc' ;
bless \[], "" ;
no warnings 'misc' ;
bless \[], "" ;
EXPECT
Explicit blessing to '' (assuming package main) at - line 3.
########
# pp.c
use warnings 'misc';
sub foo () { 1 }
undef &foo;
no warnings 'misc';
sub bar () { 2 }
undef &bar;
EXPECT
Constant subroutine foo undefined at - line 4.
########
# pp.c
use warnings 'misc';
$foo = sub () { 3 };
undef &$foo;
no warnings 'misc';
$bar = sub () { 4 };
undef &$bar;
EXPECT
Constant subroutine (anonymous) undefined at - line 4.
########
# pp.c
use utf8 ;
$_ = "\x80  \xff" ;
reverse ;
EXPECT