utf8.c AOK

     [utf8_to_uv]
     Malformed UTF-8 character
	my $a = ord "\x80" ;

     Malformed UTF-8 character
	my $a = ord "\xf080" ;
     <<<<<< this warning can't be easily triggered from perl anymore

     [utf16_to_utf8]
     Malformed UTF-16 surrogate		
     <<<<<< Add a test when somethig actually calls utf16_to_utf8

__END__
# utf8.c [utf8_to_uv] -W
BEGIN {
    if (ord('A') == 193) {
        print "SKIPPED\n# ebcdic platforms do not generate Malformed UTF-8 warnings.";
        exit 0;
    }
}
use utf8 ;
my $a = "snøstorm" ;
{
    no warnings 'utf8' ;
    my $a = "snøstorm";
    use warnings 'utf8' ;
    my $a = "snøstorm";
}
EXPECT
Malformed UTF-8 character (unexpected non-continuation byte 0x73, immediately after start byte 0xf8) at - line 9.
Malformed UTF-8 character (unexpected non-continuation byte 0x73, immediately after start byte 0xf8) at - line 14.
########
use warnings 'utf8';
my $surr = chr(0xD800);
my $fff3 = chr(0xFFFE);
my $ffff = chr(0xFFFF);
no warnings 'utf8';
$surr = chr(0xD800);
$fffe = chr(0xFFFE);
$ffff = chr(0xFFFF);
EXPECT
UTF-16 surrogate 0xd800 at - line 2.
Unicode character 0xfffe is illegal at - line 3.
Unicode character 0xffff is illegal at - line 4.
########