Returns an array of lines in strsplit using the supplied record separator
($/ by default). This is a shorthand for str.each_line(separator).to_a.
If a block is given, which is a deprecated form, works the same as each_line.
static VALUE
rb_str_lines(int argc, VALUE *argv, VALUE str)
{
VALUE ary = WANTARRAY("lines", 0);
return rb_str_enumerate_lines(argc, argv, str, ary);
}