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 .../warnings.pm line xxx.
    warnings::import called at - line 3 character 1.
    BEGIN called at - line 3 character 1.
########

# Check runtime scope of pragma
use warnings 'uninitialized' ;
do {
    no warnings ;
    my $b ; chop $b ;
};
my $b ; chop $b ;
EXPECT
Use of uninitialized value $b in chop at - line 8 character 9.
########

# Check runtime scope of pragma
no warnings ;
do {
    use warnings 'uninitialized' ;
    my $b ; chop $b ;
};
my $b ; chop $b ;
EXPECT
Use of uninitialized value $b in chop at - line 6 character 13.
########

# Check runtime scope of pragma
no warnings ;
do {
    use warnings 'uninitialized' ;
    $a = sub { my $b ; chop $b ; }
};
&$a() ;
EXPECT
Use of uninitialized value $b in chop at - line 6 character 24.
    main::__ANON__ called at - line 8 character 1.
########
-w
no warnings 'reserved' ;
foo.bar;
EXPECT
Unknown bare word foo at - line 3, at end of line
Unknown bare word bar at - line 3, at end of line
Bareword "foo" not allowed while "strict subs" in use at - line 3 character 1.
########

# Check scope of pragma with eval
use warnings;
do {
    no warnings ;
    try {
        my $b ; chop $b ;
    }; print $^STDERR, $^EVAL_ERROR ;
    my $b ; chop $b ;
};
EXPECT

########

# Check scope of pragma with eval
use warnings;
do {
    no warnings ;
    try {
        use warnings 'uninitialized' ;
        my $b ; chop $b ;
    }; print $^STDERR, $^EVAL_ERROR ;
    my $b ; chop $b ;
};
EXPECT
Use of uninitialized value $b in chop at - line 8 character 17.
    (eval) called at - line 6 character 5.
########

# Check scope of pragma with eval
no warnings;
do {
    use warnings 'uninitialized' ;
    try {
        my $b ; chop $b ;
    }; print $^STDERR, $^EVAL_ERROR ;
    my $b ; chop $b ;
};
EXPECT
Use of uninitialized value $b in chop at - line 7 character 17.
    (eval) called at - line 6 character 5.
Use of uninitialized value $b in chop at - line 9 character 13.
########

# Check scope of pragma with eval
no warnings;
do {
    use warnings 'uninitialized' ;
    try {
        no warnings ;
        my $b ; chop $b ;
    }; print $^STDERR, $^EVAL_ERROR ;
    my $b ; chop $b ;
};
EXPECT
Use of uninitialized value $b in chop at - line 10 character 13.
########

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

########

# Check scope of pragma with eval
use warnings;
do {
    no warnings ;
    eval q[ 
        use warnings 'uninitialized' ;
        my $b ; chop $b ;
    ]; print $^STDERR, $^EVAL_ERROR;
    my $b ; chop $b ;
};
EXPECT
Use of uninitialized value $b in chop at (eval 1) line 3 character 58.
    (eval) called at - line 6 character 5.
########

# Check scope of pragma with eval
no warnings;
do {
    use warnings 'uninitialized' ;
    eval '
        my $b ; chop $b ;
    '; print $^STDERR, $^EVAL_ERROR ;
    my $b ; chop $b ;
};
EXPECT
Use of uninitialized value $b in chop at (eval 1) line 2 character 18.
    (eval) called at - line 6 character 5.
Use of uninitialized value $b in chop at - line 9 character 13.
########

# Check scope of pragma with eval
no warnings;
do {
    use warnings 'uninitialized' ;
    eval '
        no warnings ;
        my $b ; chop $b ;
    '; print $^STDERR, $^EVAL_ERROR ;
    my $b ; chop $b ;
};
EXPECT
Use of uninitialized value $b in chop at - line 10 character 13.