mg.c	AOK

  No such signal: SIG%s
    $SIG{FRED} = sub {}

  SIG%s handler \"%s\" not defined.
    $SIG{"INT"} = "ok3"; kill "INT",$$;


__END__
# mg.c
use warning 'signal' ;
$SIG{FRED} = sub {};
EXPECT
No such signal: SIGFRED at - line 3.
########
# mg.c
use warning 'signal' ;
$|=1;
$SIG{"INT"} = "fred"; kill "INT",$$;
EXPECT
SIGINT handler "fred" not defined.