Check lexical warnings functionality

TODO
  check that the warning hierarchy works.

__END__

# check illegal category is caught
use warnings 'blah' ;
EXPECT
unknown warning category 'blah' at - line 3
BEGIN failed--compilation aborted at - line 3.
########

# Check compile time scope of pragma
use warnings 'deprecated' ;
{
    no warnings ;
    1 if $a EQ $b ;
}
1 if $a EQ $b ;
EXPECT
Use of EQ is deprecated at - line 8.
########

# Check compile time scope of pragma
no warnings;
{
    use warnings 'deprecated' ;
    1 if $a EQ $b ;
}
1 if $a EQ $b ;
EXPECT
Use of EQ is deprecated at - line 6.
########

# Check runtime scope of pragma
use warnings 'uninitialized' ;
{
    no warnings ;
    my $b ; chop $b ;
}
my $b ; chop $b ;
EXPECT
Use of uninitialized value in scalar chop at - line 8.
########

# Check runtime scope of pragma
no warnings ;
{
    use warnings 'uninitialized' ;
    my $b ; chop $b ;
}
my $b ; chop $b ;
EXPECT
Use of uninitialized value in scalar chop at - line 6.
########

# Check runtime scope of pragma
no warnings ;
{
    use warnings 'uninitialized' ;
    $a = sub { my $b ; chop $b ; }
}
&$a ;
EXPECT
Use of uninitialized value in scalar chop at - line 6.
########

use warnings 'deprecated' ;
1 if $a EQ $b ;
EXPECT
Use of EQ is deprecated at - line 3.
########

--FILE-- abc
1 if $a EQ $b ;
1;
--FILE-- 
use warnings 'deprecated' ;
require "./abc";
EXPECT

########

--FILE-- abc
use warnings 'deprecated' ;
1;
--FILE-- 
require "./abc";
1 if $a EQ $b ;
EXPECT

########

--FILE-- abc
use warnings 'deprecated' ;
1 if $a EQ $b ;
1;
--FILE-- 
use warnings 'uninitialized' ;
require "./abc";
my $a ; chop $a ;
EXPECT
Use of EQ is deprecated at ./abc line 2.
Use of uninitialized value in scalar chop at - line 3.
########

--FILE-- abc.pm
use warnings 'deprecated' ;
1 if $a EQ $b ;
1;
--FILE-- 
use warnings 'uninitialized' ;
use abc;
my $a ; chop $a ;
EXPECT
Use of EQ is deprecated at abc.pm line 2.
Use of uninitialized value in scalar chop at - line 3.
########

# Check scope of pragma with eval
no warnings ;
eval {
    my $b ; chop $b ;
}; print STDERR $@ ;
my $b ; chop $b ;
EXPECT

########

# Check scope of pragma with eval
no warnings ;
eval {
    use warnings 'uninitialized' ;
    my $b ; chop $b ;
}; print STDERR $@ ;
my $b ; chop $b ;
EXPECT
Use of uninitialized value in scalar chop at - line 6.
########

# Check scope of pragma with eval
use warnings 'uninitialized' ;
eval {
    my $b ; chop $b ;
}; print STDERR $@ ;
my $b ; chop $b ;
EXPECT
Use of uninitialized value in scalar chop at - line 5.
Use of uninitialized value in scalar chop at - line 7.
########

# Check scope of pragma with eval
use warnings 'uninitialized' ;
eval {
    no warnings ;
    my $b ; chop $b ;
}; print STDERR $@ ;
my $b ; chop $b ;
EXPECT
Use of uninitialized value in scalar chop at - line 8.
########

# Check scope of pragma with eval
no warnings ;
eval {
    1 if $a EQ $b ;
}; print STDERR $@ ;
1 if $a EQ $b ;
EXPECT

########

# Check scope of pragma with eval
no warnings ;
eval {
    use warnings 'deprecated' ;
    1 if $a EQ $b ;
}; print STDERR $@ ;
1 if $a EQ $b ;
EXPECT
Use of EQ is deprecated at - line 6.
########

# Check scope of pragma with eval
use warnings 'deprecated' ;
eval {
    1 if $a EQ $b ;
}; print STDERR $@ ;
1 if $a EQ $b ;
EXPECT
Use of EQ is deprecated at - line 5.
Use of EQ is deprecated at - line 7.
########

# Check scope of pragma with eval
use warnings 'deprecated' ;
eval {
    no warnings ;
    1 if $a EQ $b ;
}; print STDERR $@ ;
1 if $a EQ $b ;
EXPECT
Use of EQ is deprecated at - line 8.
########

# Check scope of pragma with eval
no warnings ;
eval '
    my $b ; chop $b ;
'; print STDERR $@ ;
my $b ; chop $b ;
EXPECT

########

# Check scope of pragma with eval
no warnings ;
eval q[ 
    use warnings 'uninitialized' ;
    my $b ; chop $b ;
]; print STDERR $@;
my $b ; chop $b ;
EXPECT
Use of uninitialized value in scalar chop at (eval 1) line 3.
########

# Check scope of pragma with eval
use warnings 'uninitialized' ;
eval '
    my $b ; chop $b ;
'; print STDERR $@ ;
my $b ; chop $b ;
EXPECT
Use of uninitialized value in scalar chop at (eval 1) line 2.
Use of uninitialized value in scalar chop at - line 7.
########

# Check scope of pragma with eval
use warnings 'uninitialized' ;
eval '
    no warnings ;
    my $b ; chop $b ;
'; print STDERR $@ ;
my $b ; chop $b ;
EXPECT
Use of uninitialized value in scalar chop at - line 8.
########

# Check scope of pragma with eval
no warnings ;
eval '
    1 if $a EQ $b ;
'; print STDERR $@ ;
1 if $a EQ $b ;
EXPECT

########

# Check scope of pragma with eval
no warnings ;
eval q[ 
    use warnings 'deprecated' ;
    1 if $a EQ $b ;
]; print STDERR $@;
1 if $a EQ $b ;
EXPECT
Use of EQ is deprecated at (eval 1) line 3.
########

# Check scope of pragma with eval
use warnings 'deprecated' ;
eval '
    1 if $a EQ $b ;
'; print STDERR $@;
1 if $a EQ $b ;
EXPECT
Use of EQ is deprecated at - line 7.
Use of EQ is deprecated at (eval 1) line 2.
########

# Check scope of pragma with eval
use warnings 'deprecated' ;
eval '
    no warnings ;
    1 if $a EQ $b ;
'; print STDERR $@;
1 if $a EQ $b ;
EXPECT
Use of EQ is deprecated at - line 8.
########

# Check the additive nature of the pragma
1 if $a EQ $b ;
my $a ; chop $a ;
use warnings 'deprecated' ;
1 if $a EQ $b ;
my $b ; chop $b ;
use warnings 'uninitialized' ;
my $c ; chop $c ;
no warnings 'deprecated' ;
1 if $a EQ $b ;
EXPECT
Use of EQ is deprecated at - line 6.
Use of uninitialized value in scalar chop at - line 9.
Use of uninitialized value in string eq at - line 11.
Use of uninitialized value in string eq at - line 11.