Check lexical warnings functionality

TODO
  check that the warning hierarchy works.

__END__

#  check illegal category is caught
use warnings 'this-should-never-be-a-warning-category' ;
EXPECT
Unknown warnings category 'this-should-never-be-a-warning-category' at - line 3
BEGIN failed--compilation aborted at - line 3.
########

# Check compile time scope of pragma
use warnings 'syntax' ;
{
    no warnings ;
    my $a =+ 1 ;
}
my $a =+ 1 ;
EXPECT
Reversed += operator at - line 8.
########

# Check compile time scope of pragma
no warnings;
{
    use warnings 'syntax' ;
    my $a =+ 1 ;
}
my $a =+ 1 ;
EXPECT
Reversed += operator 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 'syntax' ;
my $a =+ 1 ;
EXPECT
Reversed += operator at - line 3.
########

--FILE-- abc
my $a =+ 1 ;
1;
--FILE-- 
use warnings 'syntax' ;
require "./abc";
EXPECT

########

--FILE-- abc
use warnings 'syntax' ;
1;
--FILE-- 
require "./abc";
my $a =+ 1 ;
EXPECT

########

--FILE-- abc
use warnings 'syntax' ;
my $a =+ 1 ;
1;
--FILE-- 
use warnings 'uninitialized' ;
require "./abc";
my $a ; chop $a ;
EXPECT
Reversed += operator at ./abc line 2.
Use of uninitialized value in scalar chop at - line 3.
########

--FILE-- abc.pm
use warnings 'syntax' ;
my $a =+ 1 ;
1;
--FILE-- 
use warnings 'uninitialized' ;
use abc;
my $a ; chop $a ;
EXPECT
Reversed += operator at abc.pm line 2.
Use of uninitialized value in scalar chop at - line 3.
########

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

########

# Check scope of pragma with eval
use warnings;
{
    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 8.
########

# Check scope of pragma with eval
no warnings;
{
    use warnings 'uninitialized' ;
    eval {
        my $b ; chop $b ;
    }; print STDERR $@ ;
    my $b ; chop $b ;
}
EXPECT
Use of uninitialized value in scalar chop at - line 7.
Use of uninitialized value in scalar chop at - line 9.
########

# Check scope of pragma with eval
no warnings;
{
    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 10.
########

# Check scope of pragma with eval
use warnings;
{
    no warnings ;
    eval {
        my $a =+ 1 ;
    }; print STDERR $@ ;
    my $a =+ 1 ;
}
EXPECT

########

# Check scope of pragma with eval
use warnings;
{
    no warnings ;
    eval {
        use warnings 'syntax' ;
        my $a =+ 1 ;
    }; print STDERR $@ ;
    my $a =+ 1 ;
}
EXPECT
Reversed += operator at - line 8.
########

# Check scope of pragma with eval
no warnings;
{
    use warnings 'syntax' ;
    eval {
        my $a =+ 1 ;
    }; print STDERR $@ ;
    my $a =+ 1 ;
}
EXPECT
Reversed += operator at - line 7.
Reversed += operator at - line 9.
########

# Check scope of pragma with eval
no warnings;
{
    use warnings 'syntax' ;
    eval {
        no warnings ;
        my $a =+ 1 ;
    }; print STDERR $@ ;
    my $a =+ 1 ;
}
EXPECT
Reversed += operator at - line 10.
########

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

########

# Check scope of pragma with eval
use warnings;
{
    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
no warnings;
{
    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 9.
########

# Check scope of pragma with eval
no warnings;
{
    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 10.
########

# Check scope of pragma with eval
use warnings;
{
    no warnings ;
    eval '
        my $a =+ 1 ;
    '; print STDERR $@ ;
    my $a =+ 1 ;
}
EXPECT

########

# Check scope of pragma with eval
use warnings;
{
    no warnings ;
    eval q[ 
        use warnings 'syntax' ;
        my $a =+ 1 ;
    ]; print STDERR $@;
    my $a =+ 1 ;
}
EXPECT
Reversed += operator at (eval 1) line 3.
########

# Check scope of pragma with eval
no warnings;
{
    use warnings 'syntax' ;
    eval '
        my $a =+ 1 ;
    '; print STDERR $@;
    my $a =+ 1 ;
}
EXPECT
Reversed += operator at - line 9.
Reversed += operator at (eval 1) line 2.
########

# Check scope of pragma with eval
no warnings;
{
    use warnings 'syntax' ;
    eval '
        no warnings ;
        my $a =+ 1 ;
    '; print STDERR $@;
    my $a =+ 1 ;
}
EXPECT
Reversed += operator at - line 10.
########

# Check the additive nature of the pragma
my $a =+ 1 ;
my $a ; chop $a ;
use warnings 'syntax' ;
$a =+ 1 ;
my $b ; chop $b ;
use warnings 'uninitialized' ;
my $c ; chop $c ;
no warnings 'syntax' ;
$a =+ 1 ;
EXPECT
Reversed += operator at - line 6.
Use of uninitialized value in scalar chop at - line 9.